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From: David Allan I <david.i.allan@ericsson.com>
To: "pim@ietf.org" <pim@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "isis-wg@ietf.org list (isis-wg@ietf.org)" <isis-wg@ietf.org>, "ospf@ietf.org" <ospf@ietf.org>
Thread-Topic: Computed Multicast for SPRING
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Date: Mon, 3 Oct 2016 20:59:32 +0000
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Subject: [OSPF] Computed Multicast for SPRING
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HI Folks:

For those interested in the subject, we've assembled a tutorial as a compan=
ion to version 2 of the framework draft (draft-allan-spring-mpls-multicast-=
framework-02), that explains the approach and the algorithm in much greater=
 detail.

It is available here:
http://standards.ericsson.com/mpls/SPRING_Multicast_Tutorial_v4.pdf

As always comments and questions are very welcome....

Cheers
Dave

--_000_E6C17D2345AC7A45B7D054D407AA205C4BDDB302eusaamb105erics_
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<p class=3D"MsoNormal">HI Folks:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">For those interested in the subject, we&#8217;ve ass=
embled a tutorial as a companion to version 2 of the framework draft (draft=
-allan-spring-mpls-multicast-framework-02), that explains the approach and =
the algorithm in much greater detail.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">It is available here:<o:p></o:p></p>
<p class=3D"MsoNormal"><a href=3D"http://standards.ericsson.com/mpls/SPRING=
_Multicast_Tutorial_v4.pdf">http://standards.ericsson.com/mpls/SPRING_Multi=
cast_Tutorial_v4.pdf</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">As always comments and questions are very welcome&#8=
230;.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Cheers<o:p></o:p></p>
<p class=3D"MsoNormal">Dave<o:p></o:p></p>
</div>
</body>
</html>

--_000_E6C17D2345AC7A45B7D054D407AA205C4BDDB302eusaamb105erics_--


From nobody Mon Oct 10 07:18:47 2016
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Mirja KÃ¼hlewind has entered the following ballot position for
draft-ietf-ospf-two-part-metric-09: No Objection

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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Two quick questions:

1) Why does this doc update 2328 and 5340? I would assume an TLV
extension does not need to update the base protocol.

2) Why is the OSPFv3 extension described in a separate document?



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Alissa Cooper has entered the following ballot position for
draft-ietf-ospf-two-part-metric-09: No Objection

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The document, along with other ballot positions, can be found here:
https://datatracker.ietf.org/doc/draft-ietf-ospf-two-part-metric/



----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

If the update to RFC 5340 is kept, it should be mentioned in the
abstract.



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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, OSPF WG List <ospf@ietf.org>
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--_000_7fb89f5329694531b015aeae195e8646XCHALN001ciscocom_--


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From: "Dongjie (Jimmy)" <jie.dong@huawei.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "Acee Lindem (acee)" <acee@cisco.com>, OSPF WG List <ospf@ietf.org>
Thread-Topic: [OSPF] FW: Solicit feedbacks on draft-dong-ospf-maxage-flush-problem-statement
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Date: Wed, 12 Oct 2016 06:47:08 +0000
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Subject: Re: [OSPF] FW: Solicit feedbacks on draft-dong-ospf-maxage-flush-problem-statement
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Date: Wed, 12 Oct 2016 10:05:26 +0200
From: Peter Psenak <ppsenak@cisco.com>
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Subject: Re: [OSPF] FW: Solicit feedbacks on draft-dong-ospf-maxage-flush-problem-statement
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No support. We should not modify protocol to address possible bugs in 
the implementation.

thanks,
Peter

On 11/10/16 20:51 , Acee Lindem (acee) wrote:
> Speaking as WG Co-Chair:
>
> We had a quite a lengthy discussion on this problem and whether or it is
> something the WG should adopt. Please indicate whether or not you would
> support WG adoption before Oct 26th, 2016.
>
> Thanks,
> Acee
>
> From: "lizhenqiang@chinamobile.com <mailto:lizhenqiang@chinamobile.com>"
> <lizhenqiang@chinamobile.com <mailto:lizhenqiang@chinamobile.com>>
> Date: Thursday, August 25, 2016 at 9:29 PM
> To: Acee Lindem <acee@cisco.com <mailto:acee@cisco.com>>, Jie Dong
> <jie.dong@huawei.com <mailto:jie.dong@huawei.com>>, "Les Ginsberg
> (ginsberg)" <ginsberg@cisco.com <mailto:ginsberg@cisco.com>>, OSPF WG
> List <ospf@ietf.org <mailto:ospf@ietf.org>>
> Cc: "Zhangxudong (zhangxudong, VRP)" <zhangxudong@huawei.com
> <mailto:zhangxudong@huawei.com>>
> Subject: Re: Re: [OSPF] Solicit feedbacks on
> draft-dong-ospf-maxage-flush-problem-statement
>
>     Hi Acee,
>
>     Totally agree with you that we have to avoid significant
>     modification to OSPF.
>
>     The common point after the mail discussion is production network
>     running OSPF DOES have some problems due to software implementation
>     bugs or hardware defects. Those production network problems deserve
>     some proposals both to identify the router with bugs and to mitigate
>     the problem, for example to reduce th impact of OSPF route flapping.
>
>     Your suggestion is one option about defective router identification.
>     Thank you very much.
>
>     Best Regards,
>     ------------------------------------------------------------------------
>     lizhenqiang@chinamobile.com <mailto:lizhenqiang@chinamobile.com>
>
>         *From:* Acee Lindem (acee) <mailto:acee@cisco.com>
>         *Date:* 2016-08-25 03:04
>         *To:* lizhenqiang@chinamobile.com
>         <mailto:lizhenqiang@chinamobile.com>; Dongjie (Jimmy)
>         <mailto:jie.dong@huawei.com>; Les Ginsberg (ginsberg)
>         <mailto:ginsberg@cisco.com>; ospf@ietf.org <mailto:ospf@ietf.org>
>         *CC:* Zhangxudong (zhangxudong, VRP) <mailto:zhangxudong@huawei.com>
>         *Subject:* Re: [OSPF] Solicit feedbacks on
>         draft-dong-ospf-maxage-flush-problem-statement
>         Speaking as WG member:
>
>         Hi Zhenjiang,
>
>         I don’t doubt that this was a very disquieting experience.
>         However, I still don’t think we should attempt to change the
>         protocol to compensate for routers that do not adhere to the
>         protocol. To make an analogy, in my years of OSPF experience
>         I’ve been subject to a number of bugs related to OSPF’s usage of
>         local wire multicast (some triggered by obscure conditions such
>         as routing and bridging on the same port). However, I’ve never
>         proposed to not use local wire multicast. Also, after 25 years
>         of OSPFv2, it doesn’t make sense to try and change the protocol
>         to avoid bugs in this area. As for identifying the nefarious
>         router, I think adding a counter and possibly a separate
>         notification to the YANG model might be warranted since purging
>         a non-self-originated LSA should not be a common occurrence in
>         most networks.
>
>         Thanks,
>         Acee
>         P.S. Since this is an OSPF standards list, I’ve purposely
>         avoided the questions as to how this catastrophic bug made it
>         into a production network.
>
>
>         From: "lizhenqiang@chinamobile.com
>         <mailto:lizhenqiang@chinamobile.com>"
>         <lizhenqiang@chinamobile.com <mailto:lizhenqiang@chinamobile.com>>
>         Date: Wednesday, August 24, 2016 at 2:11 PM
>         To: Jie Dong <jie.dong@huawei.com <mailto:jie.dong@huawei.com>>,
>         Acee Lindem <acee@cisco.com <mailto:acee@cisco.com>>, "Les
>         Ginsberg (ginsberg)" <ginsberg@cisco.com
>         <mailto:ginsberg@cisco.com>>, OSPF WG List <ospf@ietf.org
>         <mailto:ospf@ietf.org>>
>         Cc: "Zhangxudong (zhangxudong, VRP)" <zhangxudong@huawei.com
>         <mailto:zhangxudong@huawei.com>>
>         Subject: Re: RE: [OSPF] Solicit feedbacks on
>         draft-dong-ospf-maxage-flush-problem-statement
>
>             Hello Jie, Acee and Les,
>
>             I am a coauthor of this draft from operator China Mobile.
>             Thank you all for your discussion and suggestion in the
>             previous mails. As you all discussed, a misbehavior OSPF
>             router (due to software or hardware problem) can cause
>             severe problem in the whole OSPF domain.
>
>             Here I want to point out that OSPF route flapping DID occour
>             in my field network contributed by a misbehavior OSPF router
>             installed. The procedure to analyze and look for the cause
>             were very complicated because we did not know the source of
>             the flushing. Two hours past, we could not identify the real
>             cause and restore our network. The CPU utilization of OSPF
>             routers was high, the network traffic decreased
>             significantly, lots of tunnel down warnings raised. When we
>             tried to shutdown one OSPF router, route flapping stopped.
>             This router was a newly deployed one. Through communication
>             with our vendor, they admitted that this product had some
>             defects in dealing with OSPF protocol. This kind of defects
>             are difficult for us to test  when they apply for entrance
>             in our network. Once defective products are deployed in the
>             field network,  locating the problem is very hard and time
>             consuming.
>
>             So, I think it is necessary for us to solve the problem and
>             improve the robustness of the protocol.At least it should
>             provide the means to help us locate the OSPF route flapping
>             problem.
>
>             ------------------------------------------------------------------------
>             lizhenqiang@chinamobile.com <mailto:lizhenqiang@chinamobile.com>
>
>                 *From:* Dongjie (Jimmy) <mailto:jie.dong@huawei.com>
>                 *Date:* 2016-08-18 17:09
>                 *To:* Acee Lindem (acee) <mailto:acee@cisco.com>; Les
>                 Ginsberg (ginsberg) <mailto:ginsberg@cisco.com>;
>                 ospf@ietf.org <mailto:ospf@ietf.org>
>                 *CC:* Zhangxudong (zhangxudong, VRP)
>                 <mailto:zhangxudong@huawei.com>;
>                 lizhenqiang@chinamobile.com
>                 <mailto:lizhenqiang@chinamobile.com>
>                 *Subject:* RE: [OSPF] Solicit feedbacks on
>                 draft-dong-ospf-maxage-flush-problem-statement
>
>                 Hi Acee,
>
>                 Please see my replies inline:
>
>                 *From:*Acee Lindem (acee) [mailto:acee@cisco.com]
>                 *Sent:* Thursday, August 18, 2016 2:23 AM
>                 *To:* Dongjie (Jimmy); Les Ginsberg (ginsberg);
>                 ospf@ietf.org <mailto:ospf@ietf.org>
>                 *Cc:* Zhangxudong (zhangxudong, VRP);
>                 lizhenqiang@chinamobile.com
>                 <mailto:lizhenqiang@chinamobile.com>
>                 *Subject:* Re: [OSPF] Solicit feedbacks on
>                 draft-dong-ospf-maxage-flush-problem-statement
>
>                 Speaking as a WG member who has some experience with
>                 OSPF implementations:
>
>                 Hi Jie,
>
>                 Along with Les, I’m also against progressing this draft.
>
>                 *From: *Jie Dong <jie.dong@huawei.com
>                 <mailto:jie.dong@huawei.com>>
>                 *Date: *Tuesday, August 16, 2016 at 9:56 AM
>                 *To: *Acee Lindem <acee@cisco.com
>                 <mailto:acee@cisco.com>>, "Les Ginsberg (ginsberg)"
>                 <ginsberg@cisco.com <mailto:ginsberg@cisco.com>>, OSPF
>                 WG List <ospf@ietf.org <mailto:ospf@ietf.org>>
>                 *Cc: *"Zhangxudong (zhangxudong, VRP)"
>                 <zhangxudong@huawei.com
>                 <mailto:zhangxudong@huawei.com>>,
>                 "lizhenqiang@chinamobile.com
>                 <mailto:lizhenqiang@chinamobile.com>"
>                 <lizhenqiang@chinamobile.com
>                 <mailto:lizhenqiang@chinamobile.com>>
>                 *Subject: *RE: [OSPF] Solicit feedbacks on
>                 draft-dong-ospf-maxage-flush-problem-statement
>
>                     Hi Acee,
>
>                     Thanks a lot for your feedbacks.
>
>                     For packet corruption which impacts the LS age
>                     before the LSAs are packed into LSU packet, I agree
>                     it is less likely to happen than the other cases.
>                     However I think we agree that OSPF authentication
>                     only protect the packet level corruption, which
>                     cannot help to detect the corruption at LSA level.
>
>                 So, you are suggesting that LSAs are corrupted in the
>                 database in such a way that the LSA Age is set exactly
>                 to 0xE10? How would the implementation know that this
>                 had happened and prematurely age the packet? Database
>                 aging just doesn’t work this way (unless the
>                 implementation is particularly naïve).
>
>                 [Jie] Actually the case is when the LSA is about to be
>                 exchanged with neighbor, during the message packing the
>                 LS age is corrupted to either Maxage or a large number
>                 close to Maxage. The sending router does not intend to
>                 do a Maxage flush, however the neighbor routers which
>                 receive the message would treat this as a flush. This is
>                 a possible case although less likely to happen than the
>                 other cases.
>
>                     In my understanding, robustness is an important
>                     feature of network protocols, which include the
>                     robustness to errors and failures happened in the
>                     network. If there is a bug in a particular router in
>                     the network, operator would not allow the whole
>                     network being impacted, which means other routers in
>                     the network needs to work properly in this
>                     situation. For example in BGP, the error handling
>                     mechanism has been optimized to avoid unnecessary
>                     session teardown.
>
>                 So you agree your problem statement is confined to a
>                 software bug resulting in LSAs being aged too quickly? I
>                 think this is the third time I’ve raised this question.
>
>                 [Jie] As I said before, the problems happened in the
>                 production network are caused by software bug in LSA
>                 aging, so I think this is the major case.
>
>                 If it has such a problem (whether it be due to a system
>                 timer bug or a some more specific aging problem), it
>                 seems the router would also be refreshing its LSAs all
>                 too frequently (at least at twice the rate) and it would
>                 be readily identifiable. For a system time problem, the
>                 router would likely have many other problems. For
>                 example, it would not maintain OSPF adjacencies if the
>                 dead timer advances fast enough. It would retransmit at
>                 a very fast rate as well. Are you going to write problem
>                 statements and suggest solutions for these situations as
>                 well?
>
>                 [Jie] This depends on the implementation. the software
>                 bug may only impact the aging of LSAs received from
>                 other routers. And frequent LSA refreshing may be caused
>                 by other cases such as link oscillation.  For a system
>                 timer problem, OSPF adjacency may oscillate, but if the
>                 management connection is impacted, such oscillation is
>                 difficult to be identified.
>
>                 What about other bugs? What if the router erroneously
>                 specifies a neighbor’s router-id as its own in a
>                 Router-LSA? Is this a problem the protocol should handle?
>
>                 [Jie] Depends on the significance to network, case by
>                 case analysis may be needed.
>
>                     I agree that OSPF Yang notification for LSA timeout
>                     is a nice thing to have and could be useful to
>                     identify the misbehaved router. My concern is
>                     sometimes the network may be severely impacted that
>                     the connectivity of netconf/restconf is also
>                     impacted. To avoid this, some mechanism to mitigate
>                     the impact of this problem could help.
>
>                 I believe a router have such impact would be easy to
>                 identify…
>
>                 [Jie] According to the feedback from on-site engineers,
>                 when IGP routing is oscillating severely which makes the
>                 management connection unavailable, it usually takes much
>                 longer time for troubleshooting, as logging to any
>                 router cannot be done via the management network. So
>                 maybe it would be better to have some automatic
>                 mechanism to reduce the impact before it becomes a big
>                 problem to troubleshoot.
>
>                 Best regards,
>
>                 Jie
>
>                 Thanks,
>
>                 Acee
>
>                     Best regards,
>
>                     Jie
>
>                     *From:*Acee Lindem (acee) [mailto:acee@cisco.com]
>                     *Sent:* Saturday, August 13, 2016 3:27 AM
>                     *To:* Les Ginsberg (ginsberg); Dongjie (Jimmy);
>                     ospf@ietf.org <mailto:ospf@ietf.org>
>                     *Cc:* Zhangxudong (zhangxudong, VRP);
>                     lizhenqiang@chinamobile.com
>                     <mailto:lizhenqiang@chinamobile.com>
>                     *Subject:* Re: [OSPF] Solicit feedbacks on
>                     draft-dong-ospf-maxage-flush-problem-statement
>
>                     Speaking as a WG member:
>
>                     Hi Jie,
>
>                     I believe we agree that the problem is confined to
>                     OSPF bugs, system timer bugs,  and packet
>                     corruption. I’d assert that corruption can be
>                     detected via OSPF authentication. In fact, there is
>                     a well-known antidote where IS-IS authentication was
>                     enabled solely for the purpose of filtering
>                     corrupted protocol packets in an environment with
>                     line cards that were prone to such corruption.
>                     Hence, we are left with problems based on OSPF or
>                     system timer bugs. If there were a system timer bug,
>                     I’d doubt that networking device with such a bug
>                     would be functional to the point of being able to
>                     establish and maintaining OSPF adjacencies.  Do we
>                     really want to enhance the protocol to deal with bugs?
>
>                     I’ve thought about this and one potential action I
>                     could envision would be to add a separate OSPF YANG
>                     notification where an LSA times out and a router
>                     other than the originator purges it. This way, the
>                     misbehaving OSPF router could be readily identified.
>
>                     Thanks,
>
>                     Acee
>
>                     *From: *OSPF <ospf-bounces@ietf.org
>                     <mailto:ospf-bounces@ietf.org>> on behalf of "Les
>                     Ginsberg (ginsberg)" <ginsberg@cisco.com
>                     <mailto:ginsberg@cisco.com>>
>                     *Date: *Thursday, August 11, 2016 at 1:29 PM
>                     *To: *Jie Dong <jie.dong@huawei.com
>                     <mailto:jie.dong@huawei.com>>, OSPF WG List
>                     <ospf@ietf.org <mailto:ospf@ietf.org>>
>                     *Cc: *"Zhangxudong (zhangxudong, VRP)"
>                     <zhangxudong@huawei.com
>                     <mailto:zhangxudong@huawei.com>>,
>                     "lizhenqiang@chinamobile.com
>                     <mailto:lizhenqiang@chinamobile.com>"
>                     <lizhenqiang@chinamobile.com
>                     <mailto:lizhenqiang@chinamobile.com>>
>                     *Subject: *Re: [OSPF] Solicit feedbacks on
>                     draft-dong-ospf-maxage-flush-problem-statement
>
>                         Jie –
>
>                         Having the discussion has certainly been a good
>                         thing, but if the consensus of the WG is that
>                         there is no protocol change required then there
>                         is no need for any draft – which is my current
>                         position.
>
>                         The other point is that you seem to be confusing
>                         the IS-IS Purge origination TLV (RFC 6232) with
>                         detecting invalid purges/remaining lifetime
>                         corruption. This is not the case. RFC 6232
>                         simply allows us to detect which router
>                         originated a purge – it is not able to detect
>                         whether a purge is valid/invalid – and was not
>                         motivated by concerns about remaining lifetime
>                         corruption.
>
>                             Les
>
>                         *From:*Dongjie (Jimmy) [mailto:jie.dong@huawei.com]
>                         *Sent:* Wednesday, August 10, 2016 9:24 PM
>                         *To:* Les Ginsberg (ginsberg); ospf@ietf.org
>                         <mailto:ospf@ietf.org>
>                         *Cc:* Zhangxudong (zhangxudong, VRP);
>                         lizhenqiang@chinamobile.com
>                         <mailto:lizhenqiang@chinamobile.com>
>                         *Subject:* RE: [OSPF] Solicit feedbacks on
>                         draft-dong-ospf-maxage-flush-problem-statement
>
>                         Hi Les,
>
>                         The current draft is about problem statement, so
>                         IMO what the WG needs to consider is whether
>                         this is a vulnerability of OSPF protocol, and
>                         whether it can have negative impact to the
>                         network. If the problem is acknowledged, IMO it
>                         is worth to be documented.
>
>                         The “ROI” as you mentioned is for the evaluation
>                         of the proposed solutions. I totally agree that
>                         for the timer bug case, recognizing and ignoring
>                         the received abnormal Maxage LSAs cannot stop
>                         the misbehaved router from generating further
>                         Maxage LSA, as it is a systematic problem, which
>                         can only be fixed after the operator identifies
>                         that router. This is also similar to the
>                         systematic corruption of IS-IS remain time.  And
>                         this is why this draft mentions two kinds of
>                         potential solutions, the mitigation mechanism
>                         can avoid the network being severely impacted by
>                         the problem, while for systematic problems,
>                         problem localization is needed to identify the
>                         misbehaved router and then solve the problem.
>
>                         Best regards,
>
>                         Jie
>
>                         *From:*OSPF [mailto:ospf-bounces@ietf.org] *On
>                         Behalf Of *Les Ginsberg (ginsberg)
>                         *Sent:* Monday, August 08, 2016 2:14 AM
>                         *To:* Dongjie (Jimmy) <jie.dong@huawei.com
>                         <mailto:jie.dong@huawei.com>>; ospf@ietf.org
>                         <mailto:ospf@ietf.org>
>                         *Cc:* Zhangxudong (zhangxudong, VRP)
>                         <zhangxudong@huawei.com
>                         <mailto:zhangxudong@huawei.com>>;
>                         lizhenqiang@chinamobile.com
>                         <mailto:lizhenqiang@chinamobile.com>
>                         *Subject:* Re: [OSPF] Solicit feedbacks on
>                         draft-dong-ospf-maxage-flush-problem-statement
>
>                         Jie –
>
>                         Thinking about the following some more:
>
>                         /<snip>/
>
>                         /What remains is the possibility that an
>                         implementation has some bug and unintentionally
>                         modifies the age to something other than what it
>                         should be due to the actual elapsed time since
>                         LSA generation. I suppose a mechanism equivalent
>                         to what the IS-IS draft defined i.e. setting the
>                         age to “new” (0 in OSPF case) when first
>                         receiving a non-self-generated LSA could be
>                         useful to prevent negative impacts of such an
>                         implementation bug. Is this what you intend?/
>
>                         //
>
>                         /[Jie]: More specifically, the problem could be
>                         caused by either “setting the LS age field
>                         incorrectly due to implementation bug” or
>                         “system timer runs so fast that the LS age
>                         reaches MaxAge much earlier than other routers”.
>                         Another less likely case is that the LS age
>                         field is corrupted before the LSA is assembled
>                         into OSPF packet./
>
>                         /<end snip>/
>
>                         The benefits are extremely limited. If a router
>                         prematurely ages an LSA due to a timer bug,
>                         ignoring the received LSA age on reception isn’t
>                         going to prevent premature purging by the router
>                         which has the bug. So the effect of ignoring the
>                         received LSA age prior to reaching MAXAGE will
>                         be short lived. You are then left with the
>                         possibility that an implementation corrupts the
>                         LSA age BEFORE calculating checksum/crypto
>                         authentication – but its local timeout logic is
>                         unaffected. This has very limited value. Whether
>                         the WG considers this worth pursuing is
>                         something you need to ask. For myself, I don’t
>                         see much ROI here.
>
>                            Les
>
>                         *From:*Dongjie (Jimmy) [mailto:jie.dong@huawei.com]
>                         *Sent:* Monday, August 01, 2016 9:43 PM
>                         *To:* Les Ginsberg (ginsberg); ospf@ietf.org
>                         <mailto:ospf@ietf.org>
>                         *Cc:* Zhangxudong (zhangxudong, VRP);
>                         lizhenqiang@chinamobile.com
>                         <mailto:lizhenqiang@chinamobile.com>
>                         *Subject:* RE: [OSPF] Solicit feedbacks on
>                         draft-dong-ospf-maxage-flush-problem-statement
>
>                         Hi Les,
>
>                         Please see my replies with [Jie2]:
>
>                         *From:*Les Ginsberg (ginsberg)
>                         [mailto:ginsberg@cisco.com]
>                         *Sent:* Monday, August 01, 2016 9:57 PM
>                         *To:* Dongjie (Jimmy); ospf@ietf.org
>                         <mailto:ospf@ietf.org>
>                         *Cc:* Zhangxudong (zhangxudong, VRP);
>                         lizhenqiang@chinamobile.com
>                         <mailto:lizhenqiang@chinamobile.com>
>                         *Subject:* RE: [OSPF] Solicit feedbacks on
>                         draft-dong-ospf-maxage-flush-problem-statement
>
>                         Jie -
>
>                         *From:*Dongjie (Jimmy) [mailto:jie.dong@huawei.com]
>                         *Sent:* Monday, August 01, 2016 1:44 AM
>                         *To:* Les Ginsberg (ginsberg); ospf@ietf.org
>                         <mailto:ospf@ietf.org>
>                         *Cc:* Zhangxudong (zhangxudong, VRP);
>                         lizhenqiang@chinamobile.com
>                         <mailto:lizhenqiang@chinamobile.com>
>                         *Subject:* RE: [OSPF] Solicit feedbacks on
>                         draft-dong-ospf-maxage-flush-problem-statement
>
>                         Hi Les,
>
>                         Please see inline with [Jie]:
>
>                         *From:*Les Ginsberg (ginsberg)
>                         [mailto:ginsberg@cisco.com]
>                         *Sent:* Monday, August 01, 2016 3:09 PM
>                         *To:* Dongjie (Jimmy); ospf@ietf.org
>                         <mailto:ospf@ietf.org>
>                         *Cc:* Zhangxudong (zhangxudong, VRP);
>                         lizhenqiang@chinamobile.com
>                         <mailto:lizhenqiang@chinamobile.com>
>                         *Subject:* RE: [OSPF] Solicit feedbacks on
>                         draft-dong-ospf-maxage-flush-problem-statement
>
>                         Jie –
>
>                         Fully agree that IS-IS and OSPF differ in this
>                         regard.
>
>                         https://www.ietf.org/id/draft-ietf-isis-remaining-lifetime-01.txt
>                         addresses problems where corruption of the
>                         remaining lifetime occurs either during
>                         transmission/reception or due to some DOS
>                         attack. This isn’t a concern w OSPF (hope you
>                         agree).
>
>                         [Jie]: Yes, for OSPF the corruption during
>                         packet transmission can be detected.
>
>                         What remains is the possibility that an
>                         implementation has some bug and unintentionally
>                         modifies the age to something other than what it
>                         should be due to the actual elapsed time since
>                         LSA generation. I suppose a mechanism equivalent
>                         to what the IS-IS draft defined i.e. setting the
>                         age to “new” (0 in OSPF case) when first
>                         receiving a non-self-generated LSA could be
>                         useful to prevent negative impacts of such an
>                         implementation bug. Is this what you intend?
>
>                         [Jie]: More specifically, the problem could be
>                         caused by either “setting the LS age field
>                         incorrectly due to implementation bug” or
>                         “system timer runs so fast that the LS age
>                         reaches MaxAge much earlier than other routers”.
>                         Another less likely case is that the LS age
>                         field is corrupted before the LSA is assembled
>                         into OSPF packet.
>
>                         [Jie]: Regarding the solutions space, IMO we
>                         need to consider both cases: “LS age reaches
>                         MaxAge” and “LS age close to MaxAge”. For IS-IS,
>                         RFC 6232 and RFC 6233 provide solutions for the
>                         detection and identification of corrupted IS-IS
>                         purge, while OSPF does not have similar mechanisms.
>
>                         */[Les:] It is incorrect to say that RFC 6232
>                         makes it possible to detect a corrupt purge.
>                         What it does do is to provide an indication as
>                         to which IS initiated a purge. I don’t know how
>                         OSPF would address this issue, but for OSPFv2 at
>                         least any solution would likely not be backwards
>                         compatible. For this reason I suggest that you
>                         not try to address this issue in the same draft./*
>
>                         *//*
>
>                         [Jie2]: Agreed, RFC 6232 provide the mechanism
>                         to track the misbehaved routers so that operator
>                         can fix the problem, the detection can be based
>                         on the rules in RFC 6233 or some other
>                         anomalies. Indeed for OSPFv2 legacy LSAs, it is
>                         difficult to introduce the mechanism similar to
>                         RFC 6232, while it can be easier for the
>                         OSPFv2/v3 Extended LSAs. So it depends on how
>                         backward compatible the solution should be. I
>                         agree with you that the solution for Problem
>                         Localization in OSPF needs to be provided in a
>                         separate document.
>
>                         *//*
>
>                         */Solutions to LS age  corruption can be done in
>                         a backwards compatible way, but they  MUST NOT
>                         result in discarding purges which pass
>                         authentication- doing so places you at risk for
>                         having inconsistent LSDBs in the network./*
>
>                         [Jie2]: Exactly. The received MaxAge LSAs cannot
>                         simply be discarded, the decision must be made
>                         carefully, probably based on some additional
>                         information. The authors has discussed some
>                         possible solution internally, and will prepare
>                         some material for further open discussion.
>
>                         As written, the draft makes claims that are at
>                         least misleading – and I believe actually
>                         incorrect. In Section 6 you say:
>
>                         “The LS age field may be altered as a result of
>
>                             packet corruption, such modification cannot
>                         be detected by LSA
>
>                             checksum nor OSPF packet cryptographic
>                         authentication.”
>
>                         This isn’t correct.
>
>                         [Jie] Thanks for pointing out this. This
>                         sentence need to be revised to mention “LSA
>                         corruption” rather than “packet corruption”.
>
>                         What would be helpful – at least to me – is to
>                         move from a generic problem statement to the
>                         specific problem you want to solve and the
>                         proposed solution. This also requires you to
>                         more clearly state the cases where there is an
>                         actual vulnerability. It would be a lot easier
>                         to support the draft if this were done.
>
>                         [Jie] Thanks for your suggestion. Yes we can
>                         update this draft with more specific problem
>                         statements as I mentioned above.
>
>                         [Jie] As for the proposed solutions, the current
>                         draft specifies the requirements on the
>                         potential solutions, from which we envision that
>                         different solutions maybe needed for “Impact
>                         Mitigation” and “Problem Localization”. The
>                         solution for “Impact mitigation” can be the
>                         easier one, for which we can start to discuss
>                         the potential solutions now. While the solution
>                         for “problem localization” may need more
>                         considerations.
>
>                         */[Les:] A discussion of the requirements is
>                         useful and necessary, but IMO until you propose
>                         a solution there isn’t enough substance for the
>                         document to become a WG document./*
>
>                         [Jie2] Yes the current draft focuses on the
>                         problem statement and the requirements, the goal
>                         is to firstly get the MaxAge flush problem
>                         acknowledged and reach consensus on the
>                         requirements. Then the plan is to specify the
>                         solutions in separate documents.  Your valuable
>                         suggestions will be considered, and further
>                         contributions are welcome.
>
>                         Best regards,
>
>                         Jie
>
>                         *//*
>
>                         */    Les/*
>
>                         Best regards,
>
>                         Jie
>
>                             Les
>
>                         *From:*Dongjie (Jimmy) [mailto:jie.dong@huawei.com]
>                         *Sent:* Sunday, July 31, 2016 11:48 PM
>                         *To:* Les Ginsberg (ginsberg); ospf@ietf.org
>                         <mailto:ospf@ietf.org>
>                         *Cc:* Zhangxudong (zhangxudong, VRP);
>                         lizhenqiang@chinamobile.com
>                         <mailto:lizhenqiang@chinamobile.com>
>                         *Subject:* RE: [OSPF] Solicit feedbacks on
>                         draft-dong-ospf-maxage-flush-problem-statement
>
>                         Hi Les,
>
>                         Thanks for your comments.
>
>                         OSPF packet level checksum and authentication
>                         can only protect the assembled LSU packet one
>                         hop on the wire, while cannot detect any change
>                         to LSA made by the routers. This is because the
>                         OSPF packets are re-assembled on each hop, which
>                         is slightly different from IS-IS. So the problem
>                         for OSPF is mainly due to the problems inside
>                         the router, for example protocol
>                         implementations, system timers, or some hardware
>                         problem. Actually this problem has been seen in
>                         several production networks.
>
>                         We can improve the description in the draft to
>                         make this clear.
>
>                         Best regards,
>
>                         Jie
>
>                         *From:*Les Ginsberg (ginsberg)
>                         [mailto:ginsberg@cisco.com]
>                         *Sent:* Monday, August 01, 2016 1:30 PM
>                         *To:* Dongjie (Jimmy); ospf@ietf.org
>                         <mailto:ospf@ietf.org>
>                         *Cc:* Zhangxudong (zhangxudong, VRP);
>                         lizhenqiang@chinamobile.com
>                         <mailto:lizhenqiang@chinamobile.com>
>                         *Subject:* RE: [OSPF] Solicit feedbacks on
>                         draft-dong-ospf-maxage-flush-problem-statement
>
>                         Jie –
>
>                         The draft says (Section 2):
>
>                         “Since cryptographic authentication is executed
>                         at the OSPF packet
>
>                             level, it can only protect the assembled LSU
>                         packet for one hop and
>
>                             does not provide any additional protection
>                         for the corruption of LS
>
>                             age field.”
>
>                         But as authentication is calculated at the OSPF
>                         packet level, any change to the LS age field for
>                         an individual LSA contained within the OSPF
>                         packet (e.g. by some packet corruption in
>                         transmission) would cause authentication to fail
>                         when the packet is received. So the statement
>                         you make is not correct. I therefore am
>                         struggling to understand what problem you
>                         believe is not addressed by existing
>                         authentication techniques.
>
>                             Les
>
>                         *From:*OSPF [mailto:ospf-bounces@ietf.org] *On
>                         Behalf Of *Dongjie (Jimmy)
>                         *Sent:* Sunday, July 31, 2016 8:15 PM
>                         *To:* ospf@ietf.org <mailto:ospf@ietf.org>
>                         *Cc:* Zhangxudong (zhangxudong, VRP);
>                         lizhenqiang@chinamobile.com
>                         <mailto:lizhenqiang@chinamobile.com>
>                         *Subject:* [OSPF] Solicit feedbacks on
>                         draft-dong-ospf-maxage-flush-problem-statement
>
>                         Hi all,
>
>                         draft-dong-ospf-maxage-flush-problem-statement
>                         describes the problems caused by the corruption
>                         of the LS Age field, and summarizes the
>                         requirements on potential solutions. This draft
>                         received good comments during the presentation
>                         on the IETF meeting in B.A.
>
>                         The authors would like to solicit further
>                         feedbacks from the mailing list, on both the
>                         problem statement and the solution requirements.
>                         Based on the feedbacks, we will update the
>                         problem statement draft, and work together to
>                         build suitable solutions.
>
>                         The URL of the draft is:
>
>                         https://tools.ietf.org/html/draft-dong-ospf-maxage-flush-problem-statement-00
>
>                         Comments & feedbacks are welcome.
>
>                         Best regards,
>
>                         Jie
>
>
>
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf
>



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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "Dongjie (Jimmy)" <jie.dong@huawei.com>, "Acee Lindem (acee)" <acee@cisco.com>, OSPF WG List <ospf@ietf.org>
Thread-Topic: [OSPF] FW: Solicit feedbacks on draft-dong-ospf-maxage-flush-problem-statement
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Subject: Re: [OSPF] FW: Solicit feedbacks on draft-dong-ospf-maxage-flush-problem-statement
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I fully agree. Even if there is a solution to the mentioned problem, wh=
o knows if the=20
implementation has usable code to let other routers know what it is doi=
ng...


Am Mittwoch, 12. Oktober 2016, 10:05:26 schrieb Peter Psenak:
> No support. We should not modify protocol to address possible bugs in=

> the implementation.
>=20
> thanks,
> Peter
>=20
> On 11/10/16 20:51 , Acee Lindem (acee) wrote:
> > Speaking as WG Co-Chair:
> >=20
> > We had a quite a lengthy discussion on this problem and whether or =
it is
> > something the WG should adopt. Please indicate whether or not you w=
ould
> > support WG adoption before Oct 26th, 2016.
> >=20
> > Thanks,
> > Acee
> >=20
> > From: "lizhenqiang@chinamobile.com <mailto:lizhenqiang@chinamobile.=
com>"
> > <lizhenqiang@chinamobile.com <mailto:lizhenqiang@chinamobile.com>>
> > Date: Thursday, August 25, 2016 at 9:29 PM
> > To: Acee Lindem <acee@cisco.com <mailto:acee@cisco.com>>, Jie Dong
> > <jie.dong@huawei.com <mailto:jie.dong@huawei.com>>, "Les Ginsberg
> > (ginsberg)" <ginsberg@cisco.com <mailto:ginsberg@cisco.com>>, OSPF =
WG
> > List <ospf@ietf.org <mailto:ospf@ietf.org>>
> > Cc: "Zhangxudong (zhangxudong, VRP)" <zhangxudong@huawei.com
> > <mailto:zhangxudong@huawei.com>>
> > Subject: Re: Re: [OSPF] Solicit feedbacks on
> > draft-dong-ospf-maxage-flush-problem-statement
> >=20
> >     Hi Acee,
> >    =20
> >     Totally agree with you that we have to avoid significant
> >     modification to OSPF.
> >    =20
> >     The common point after the mail discussion is production networ=
k
> >     running OSPF DOES have some problems due to software implementa=
tion
> >     bugs or hardware defects. Those production network problems des=
erve
> >     some proposals both to identify the router with bugs and to mit=
igate
> >     the problem, for example to reduce th impact of OSPF route flap=
ping.
> >    =20
> >     Your suggestion is one option about defective router identifica=
tion.
> >     Thank you very much.
> >    =20
> >     Best Regards,
> >     ---------------------------------------------------------------=
-------
> >     --
> >     lizhenqiang@chinamobile.com <mailto:lizhenqiang@chinamobile.com=
>
> >    =20
> >         *From:* Acee Lindem (acee) <mailto:acee@cisco.com>
> >         *Date:* 2016-08-25 03:04
> >         *To:* lizhenqiang@chinamobile.com
> >         <mailto:lizhenqiang@chinamobile.com>; Dongjie (Jimmy)
> >         <mailto:jie.dong@huawei.com>; Les Ginsberg (ginsberg)
> >         <mailto:ginsberg@cisco.com>; ospf@ietf.org <mailto:ospf@iet=
f.org>
> >         *CC:* Zhangxudong (zhangxudong, VRP)
> >         <mailto:zhangxudong@huawei.com>
> >         *Subject:* Re: [OSPF] Solicit feedbacks on
> >         draft-dong-ospf-maxage-flush-problem-statement
> >         Speaking as WG member:
> >        =20
> >         Hi Zhenjiang,
> >        =20
> >         I don=92t doubt that this was a very disquieting experience=
.
> >         However, I still don=92t think we should attempt to change =
the
> >         protocol to compensate for routers that do not adhere to th=
e
> >         protocol. To make an analogy, in my years of OSPF experienc=
e
> >         I=92ve been subject to a number of bugs related to OSPF=92s=
 usage of
> >         local wire multicast (some triggered by obscure conditions =
such
> >         as routing and bridging on the same port). However, I=92ve =
never
> >         proposed to not use local wire multicast. Also, after 25 ye=
ars
> >         of OSPFv2, it doesn=92t make sense to try and change the pr=
otocol
> >         to avoid bugs in this area. As for identifying the nefariou=
s
> >         router, I think adding a counter and possibly a separate
> >         notification to the YANG model might be warranted since pur=
ging
> >         a non-self-originated LSA should not be a common occurrence=
 in
> >         most networks.
> >        =20
> >         Thanks,
> >         Acee
> >         P.S. Since this is an OSPF standards list, I=92ve purposely=

> >         avoided the questions as to how this catastrophic bug made =
it
> >         into a production network.
> >        =20
> >        =20
> >         From: "lizhenqiang@chinamobile.com
> >         <mailto:lizhenqiang@chinamobile.com>"
> >         <lizhenqiang@chinamobile.com <mailto:lizhenqiang@chinamobil=
e.com>>
> >         Date: Wednesday, August 24, 2016 at 2:11 PM
> >         To: Jie Dong <jie.dong@huawei.com <mailto:jie.dong@huawei.c=
om>>,
> >         Acee Lindem <acee@cisco.com <mailto:acee@cisco.com>>, "Les
> >         Ginsberg (ginsberg)" <ginsberg@cisco.com
> >         <mailto:ginsberg@cisco.com>>, OSPF WG List <ospf@ietf.org
> >         <mailto:ospf@ietf.org>>
> >         Cc: "Zhangxudong (zhangxudong, VRP)" <zhangxudong@huawei.co=
m
> >         <mailto:zhangxudong@huawei.com>>
> >         Subject: Re: RE: [OSPF] Solicit feedbacks on
> >         draft-dong-ospf-maxage-flush-problem-statement
> >        =20
> >             Hello Jie, Acee and Les,
> >            =20
> >             I am a coauthor of this draft from operator China Mobil=
e.
> >             Thank you all for your discussion and suggestion in the=

> >             previous mails. As you all discussed, a misbehavior OSP=
F
> >             router (due to software or hardware problem) can cause
> >             severe problem in the whole OSPF domain.
> >            =20
> >             Here I want to point out that OSPF route flapping DID o=
ccour
> >             in my field network contributed by a misbehavior OSPF r=
outer
> >             installed. The procedure to analyze and look for the ca=
use
> >             were very complicated because we did not know the sourc=
e of
> >             the flushing. Two hours past, we could not identify the=
 real
> >             cause and restore our network. The CPU utilization of O=
SPF
> >             routers was high, the network traffic decreased
> >             significantly, lots of tunnel down warnings raised. Whe=
n we
> >             tried to shutdown one OSPF router, route flapping stopp=
ed.
> >             This router was a newly deployed one. Through communica=
tion
> >             with our vendor, they admitted that this product had so=
me
> >             defects in dealing with OSPF protocol. This kind of def=
ects
> >             are difficult for us to test  when they apply for entra=
nce
> >             in our network. Once defective products are deployed in=
 the
> >             field network,  locating the problem is very hard and t=
ime
> >             consuming.
> >            =20
> >             So, I think it is necessary for us to solve the problem=
 and
> >             improve the robustness of the protocol.At least it shou=
ld
> >             provide the means to help us locate the OSPF route flap=
ping
> >             problem.
> >            =20
> >             -------------------------------------------------------=
-------
> >             ----------
> >             lizhenqiang@chinamobile.com
> >             <mailto:lizhenqiang@chinamobile.com>
> >            =20
> >                 *From:* Dongjie (Jimmy) <mailto:jie.dong@huawei.com=
>
> >                 *Date:* 2016-08-18 17:09
> >                 *To:* Acee Lindem (acee) <mailto:acee@cisco.com>; L=
es
> >                 Ginsberg (ginsberg) <mailto:ginsberg@cisco.com>;
> >                 ospf@ietf.org <mailto:ospf@ietf.org>
> >                 *CC:* Zhangxudong (zhangxudong, VRP)
> >                 <mailto:zhangxudong@huawei.com>;
> >                 lizhenqiang@chinamobile.com
> >                 <mailto:lizhenqiang@chinamobile.com>
> >                 *Subject:* RE: [OSPF] Solicit feedbacks on
> >                 draft-dong-ospf-maxage-flush-problem-statement
> >                =20
> >                 Hi Acee,
> >                =20
> >                 Please see my replies inline:
> >                =20
> >                 *From:*Acee Lindem (acee) [mailto:acee@cisco.com]
--nextPart2074808.IN16zJ3MyM
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html; charset="cp 1252"

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN" "http://www.w3.org/TR/=
REC-html40/strict.dtd">
<html><head><meta name=3D"qrichtext" content=3D"1" /><style type=3D"tex=
t/css">
p, li { white-space: pre-wrap; }
</style></head><body style=3D" font-family:'Tahoma'; font-size:8.25pt; =
font-weight:400; font-style:normal;">
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px;">I fully agree. Even i=
f there is a solution to the mentioned problem, who knows if the implem=
entation has usable code to let other routers know what it is doing...<=
/p>
<p style=3D"-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px=
; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0p=
x; ">&nbsp;</p>
<p style=3D"-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px=
; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0p=
x; ">&nbsp;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px;">Am Mittwoch, 12. Okto=
ber 2016, 10:05:26 schrieb Peter Psenak:</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; No support. We should not modify protocol to address possible bugs in=
</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; the implementation.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; thanks,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; Peter</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; On 11/10/16 20:51 , Acee Lindem (acee) wrote:</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; Speaking as WG Co-Chair:</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; We had a quite a lengthy discussion on this problem and whether =
or it is</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; something the WG should adopt. Please indicate whether or not yo=
u would</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; support WG adoption before Oct 26th, 2016.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; Thanks,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; Acee</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; From: &quot;lizhenqiang@chinamobile.com &lt;mailto:lizhenqiang@c=
hinamobile.com&gt;&quot;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; &lt;lizhenqiang@chinamobile.com &lt;mailto:lizhenqiang@chinamobi=
le.com&gt;&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; Date: Thursday, August 25, 2016 at 9:29 PM</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; To: Acee Lindem &lt;acee@cisco.com &lt;mailto:acee@cisco.com&gt;=
&gt;, Jie Dong</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; &lt;jie.dong@huawei.com &lt;mailto:jie.dong@huawei.com&gt;&gt;, =
&quot;Les Ginsberg</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; (ginsberg)&quot; &lt;ginsberg@cisco.com &lt;mailto:ginsberg@cisc=
o.com&gt;&gt;, OSPF WG</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; List &lt;ospf@ietf.org &lt;mailto:ospf@ietf.org&gt;&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; Cc: &quot;Zhangxudong (zhangxudong, VRP)&quot; &lt;zhangxudong@h=
uawei.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; &lt;mailto:zhangxudong@huawei.com&gt;&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; Subject: Re: Re: [OSPF] Solicit feedbacks on</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; draft-dong-ospf-maxage-flush-problem-statement</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;     Hi Acee,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;     </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;     Totally agree with you that we have to avoid significant</p>=

<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;     modification to OSPF.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;     </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;     The common point after the mail discussion is production net=
work</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;     running OSPF DOES have some problems due to software impleme=
ntation</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;     bugs or hardware defects. Those production network problems =
deserve</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;     some proposals both to identify the router with bugs and to =
mitigate</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;     the problem, for example to reduce th impact of OSPF route f=
lapping.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;     </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;     Your suggestion is one option about defective router identif=
ication.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;     Thank you very much.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;     </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;     Best Regards,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;     ------------------------------------------------------------=
----------</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;     --</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;     lizhenqiang@chinamobile.com &lt;mailto:lizhenqiang@chinamobi=
le.com&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;     </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         *From:* Acee Lindem (acee) &lt;mailto:acee@cisco.com&gt;=
</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         *Date:* 2016-08-25 03:04</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         *To:* lizhenqiang@chinamobile.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         &lt;mailto:lizhenqiang@chinamobile.com&gt;; Dongjie (Jim=
my)</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         &lt;mailto:jie.dong@huawei.com&gt;; Les Ginsberg (ginsbe=
rg)</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         &lt;mailto:ginsberg@cisco.com&gt;; ospf@ietf.org &lt;mai=
lto:ospf@ietf.org&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         *CC:* Zhangxudong (zhangxudong, VRP)</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         &lt;mailto:zhangxudong@huawei.com&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         *Subject:* Re: [OSPF] Solicit feedbacks on</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         draft-dong-ospf-maxage-flush-problem-statement</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         Speaking as WG member:</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         Hi Zhenjiang,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         I don=92t doubt that this was a very disquieting experie=
nce.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         However, I still don=92t think we should attempt to chan=
ge the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         protocol to compensate for routers that do not adhere to=
 the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         protocol. To make an analogy, in my years of OSPF experi=
ence</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         I=92ve been subject to a number of bugs related to OSPF=92=
s usage of</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         local wire multicast (some triggered by obscure conditio=
ns such</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         as routing and bridging on the same port). However, I=92=
ve never</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         proposed to not use local wire multicast. Also, after 25=
 years</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         of OSPFv2, it doesn=92t make sense to try and change the=
 protocol</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         to avoid bugs in this area. As for identifying the nefar=
ious</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         router, I think adding a counter and possibly a separate=
</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         notification to the YANG model might be warranted since =
purging</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         a non-self-originated LSA should not be a common occurre=
nce in</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         most networks.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         Thanks,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         Acee</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         P.S. Since this is an OSPF standards list, I=92ve purpos=
ely</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         avoided the questions as to how this catastrophic bug ma=
de it</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         into a production network.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         From: &quot;lizhenqiang@chinamobile.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         &lt;mailto:lizhenqiang@chinamobile.com&gt;&quot;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         &lt;lizhenqiang@chinamobile.com &lt;mailto:lizhenqiang@c=
hinamobile.com&gt;&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         Date: Wednesday, August 24, 2016 at 2:11 PM</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         To: Jie Dong &lt;jie.dong@huawei.com &lt;mailto:jie.dong=
@huawei.com&gt;&gt;,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         Acee Lindem &lt;acee@cisco.com &lt;mailto:acee@cisco.com=
&gt;&gt;, &quot;Les</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         Ginsberg (ginsberg)&quot; &lt;ginsberg@cisco.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         &lt;mailto:ginsberg@cisco.com&gt;&gt;, OSPF WG List &lt;=
ospf@ietf.org</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         &lt;mailto:ospf@ietf.org&gt;&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         Cc: &quot;Zhangxudong (zhangxudong, VRP)&quot; &lt;zhang=
xudong@huawei.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         &lt;mailto:zhangxudong@huawei.com&gt;&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         Subject: Re: RE: [OSPF] Solicit feedbacks on</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         draft-dong-ospf-maxage-flush-problem-statement</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             Hello Jie, Acee and Les,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             I am a coauthor of this draft from operator China Mo=
bile.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             Thank you all for your discussion and suggestion in =
the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             previous mails. As you all discussed, a misbehavior =
OSPF</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             router (due to software or hardware problem) can cau=
se</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             severe problem in the whole OSPF domain.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             Here I want to point out that OSPF route flapping DI=
D occour</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             in my field network contributed by a misbehavior OSP=
F router</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             installed. The procedure to analyze and look for the=
 cause</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             were very complicated because we did not know the so=
urce of</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             the flushing. Two hours past, we could not identify =
the real</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             cause and restore our network. The CPU utilization o=
f OSPF</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             routers was high, the network traffic decreased</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             significantly, lots of tunnel down warnings raised. =
When we</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             tried to shutdown one OSPF router, route flapping st=
opped.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             This router was a newly deployed one. Through commun=
ication</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             with our vendor, they admitted that this product had=
 some</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             defects in dealing with OSPF protocol. This kind of =
defects</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             are difficult for us to test  when they apply for en=
trance</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             in our network. Once defective products are deployed=
 in the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             field network,  locating the problem is very hard an=
d time</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             consuming.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             So, I think it is necessary for us to solve the prob=
lem and</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             improve the robustness of the protocol.At least it s=
hould</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             provide the means to help us locate the OSPF route f=
lapping</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             problem.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             ----------------------------------------------------=
----------</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             ----------</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             lizhenqiang@chinamobile.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             &lt;mailto:lizhenqiang@chinamobile.com&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;             </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 *From:* Dongjie (Jimmy) &lt;mailto:jie.dong@huaw=
ei.com&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 *Date:* 2016-08-18 17:09</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 *To:* Acee Lindem (acee) &lt;mailto:acee@cisco.c=
om&gt;; Les</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 Ginsberg (ginsberg) &lt;mailto:ginsberg@cisco.co=
m&gt;;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 ospf@ietf.org &lt;mailto:ospf@ietf.org&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 *CC:* Zhangxudong (zhangxudong, VRP)</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 &lt;mailto:zhangxudong@huawei.com&gt;;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 lizhenqiang@chinamobile.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 &lt;mailto:lizhenqiang@chinamobile.com&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 *Subject:* RE: [OSPF] Solicit feedbacks on</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 draft-dong-ospf-maxage-flush-problem-statement</=
p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 Hi Acee,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 Please see my replies inline:</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 *From:*Acee Lindem (acee) [mailto:acee@cisco.com=
]</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 *Sent:* Thursday, August 18, 2016 2:23 AM</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 *To:* Dongjie (Jimmy); Les Ginsberg (ginsberg);<=
/p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 ospf@ietf.org &lt;mailto:ospf@ietf.org&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 *Cc:* Zhangxudong (zhangxudong, VRP);</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 lizhenqiang@chinamobile.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 &lt;mailto:lizhenqiang@chinamobile.com&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 *Subject:* Re: [OSPF] Solicit feedbacks on</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 draft-dong-ospf-maxage-flush-problem-statement</=
p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 Speaking as a WG member who has some experience =
with</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 OSPF implementations:</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 Hi Jie,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 Along with Les, I=92m also against progressing t=
his draft.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 *From: *Jie Dong &lt;jie.dong@huawei.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 &lt;mailto:jie.dong@huawei.com&gt;&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 *Date: *Tuesday, August 16, 2016 at 9:56 AM</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 *To: *Acee Lindem &lt;acee@cisco.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 &lt;mailto:acee@cisco.com&gt;&gt;, &quot;Les Gin=
sberg (ginsberg)&quot;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 &lt;ginsberg@cisco.com &lt;mailto:ginsberg@cisco=
.com&gt;&gt;, OSPF</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 WG List &lt;ospf@ietf.org &lt;mailto:ospf@ietf.o=
rg&gt;&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 *Cc: *&quot;Zhangxudong (zhangxudong, VRP)&quot;=
</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 &lt;zhangxudong@huawei.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 &lt;mailto:zhangxudong@huawei.com&gt;&gt;,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 &quot;lizhenqiang@chinamobile.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 &lt;mailto:lizhenqiang@chinamobile.com&gt;&quot;=
</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 &lt;lizhenqiang@chinamobile.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 &lt;mailto:lizhenqiang@chinamobile.com&gt;&gt;</=
p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 *Subject: *RE: [OSPF] Solicit feedbacks on</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 draft-dong-ospf-maxage-flush-problem-statement</=
p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     Hi Acee,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     Thanks a lot for your feedbacks.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     For packet corruption which impacts the LS a=
ge</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     before the LSAs are packed into LSU packet, =
I agree</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     it is less likely to happen than the other c=
ases.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     However I think we agree that OSPF authentic=
ation</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     only protect the packet level corruption, wh=
ich</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     cannot help to detect the corruption at LSA =
level.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 So, you are suggesting that LSAs are corrupted i=
n the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 database in such a way that the LSA Age is set e=
xactly</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 to 0xE10? How would the implementation know that=
 this</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 had happened and prematurely age the packet? Dat=
abase</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 aging just doesn=92t work this way (unless the</=
p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 implementation is particularly na=EFve).</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 [Jie] Actually the case is when the LSA is about=
 to be</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 exchanged with neighbor, during the message pack=
ing the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 LS age is corrupted to either Maxage or a large =
number</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 close to Maxage. The sending router does not int=
end to</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 do a Maxage flush, however the neighbor routers =
which</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 receive the message would treat this as a flush.=
 This is</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 a possible case although less likely to happen t=
han the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 other cases.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     In my understanding, robustness is an import=
ant</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     feature of network protocols, which include =
the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     robustness to errors and failures happened i=
n the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     network. If there is a bug in a particular r=
outer in</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     the network, operator would not allow the wh=
ole</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     network being impacted, which means other ro=
uters in</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     the network needs to work properly in this</=
p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     situation. For example in BGP, the error han=
dling</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     mechanism has been optimized to avoid unnece=
ssary</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     session teardown.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 So you agree your problem statement is confined =
to a</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 software bug resulting in LSAs being aged too qu=
ickly? I</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 think this is the third time I=92ve raised this =
question.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 [Jie] As I said before, the problems happened in=
 the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 production network are caused by software bug in=
 LSA</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 aging, so I think this is the major case.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 If it has such a problem (whether it be due to a=
 system</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 timer bug or a some more specific aging problem)=
, it</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 seems the router would also be refreshing its LS=
As all</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 too frequently (at least at twice the rate) and =
it would</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 be readily identifiable. For a system time probl=
em, the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 router would likely have many other problems. Fo=
r</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 example, it would not maintain OSPF adjacencies =
if the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 dead timer advances fast enough. It would retran=
smit at</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 a very fast rate as well. Are you going to write=
 problem</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 statements and suggest solutions for these situa=
tions as</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 well?</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 [Jie] This depends on the implementation. the so=
ftware</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 bug may only impact the aging of LSAs received f=
rom</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 other routers. And frequent LSA refreshing may b=
e caused</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 by other cases such as link oscillation.  For a =
system</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 timer problem, OSPF adjacency may oscillate, but=
 if the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 management connection is impacted, such oscillat=
ion is</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 difficult to be identified.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 What about other bugs? What if the router errone=
ously</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 specifies a neighbor=92s router-id as its own in=
 a</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 Router-LSA? Is this a problem the protocol shoul=
d handle?</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 [Jie] Depends on the significance to network, ca=
se by</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 case analysis may be needed.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     I agree that OSPF Yang notification for LSA =
timeout</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     is a nice thing to have and could be useful =
to</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     identify the misbehaved router. My concern i=
s</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     sometimes the network may be severely impact=
ed that</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     the connectivity of netconf/restconf is also=
</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     impacted. To avoid this, some mechanism to m=
itigate</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     the impact of this problem could help.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 I believe a router have such impact would be eas=
y to</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 identify=85</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 [Jie] According to the feedback from on-site eng=
ineers,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 when IGP routing is oscillating severely which m=
akes the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 management connection unavailable, it usually ta=
kes much</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 longer time for troubleshooting, as logging to a=
ny</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 router cannot be done via the management network=
. So</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 maybe it would be better to have some automatic<=
/p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 mechanism to reduce the impact before it becomes=
 a big</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 problem to troubleshoot.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 Best regards,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 Jie</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 Thanks,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 Acee</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                 </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     Best regards,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     Jie</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     *From:*Acee Lindem (acee) [mailto:acee@cisco=
.com]</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     *Sent:* Saturday, August 13, 2016 3:27 AM</p=
>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     *To:* Les Ginsberg (ginsberg); Dongjie (Jimm=
y);</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     ospf@ietf.org &lt;mailto:ospf@ietf.org&gt;</=
p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     *Cc:* Zhangxudong (zhangxudong, VRP);</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     lizhenqiang@chinamobile.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     &lt;mailto:lizhenqiang@chinamobile.com&gt;</=
p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     *Subject:* Re: [OSPF] Solicit feedbacks on</=
p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     draft-dong-ospf-maxage-flush-problem-stateme=
nt</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     Speaking as a WG member:</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     Hi Jie,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     I believe we agree that the problem is confi=
ned to</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     OSPF bugs, system timer bugs,  and packet</p=
>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     corruption. I=92d assert that corruption can=
 be</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     detected via OSPF authentication. In fact, t=
here is</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     a well-known antidote where IS-IS authentica=
tion was</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     enabled solely for the purpose of filtering<=
/p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     corrupted protocol packets in an environment=
 with</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     line cards that were prone to such corruptio=
n.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     Hence, we are left with problems based on OS=
PF or</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     system timer bugs. If there were a system ti=
mer bug,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     I=92d doubt that networking device with such=
 a bug</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     would be functional to the point of being ab=
le to</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     establish and maintaining OSPF adjacencies. =
 Do we</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     really want to enhance the protocol to deal =
with bugs?</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     I=92ve thought about this and one potential =
action I</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     could envision would be to add a separate OS=
PF YANG</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     notification where an LSA times out and a ro=
uter</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     other than the originator purges it. This wa=
y, the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     misbehaving OSPF router could be readily ide=
ntified.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     Thanks,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     Acee</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     *From: *OSPF &lt;ospf-bounces@ietf.org</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     &lt;mailto:ospf-bounces@ietf.org&gt;&gt; on =
behalf of &quot;Les</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     Ginsberg (ginsberg)&quot; &lt;ginsberg@cisco=
.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     &lt;mailto:ginsberg@cisco.com&gt;&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     *Date: *Thursday, August 11, 2016 at 1:29 PM=
</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     *To: *Jie Dong &lt;jie.dong@huawei.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     &lt;mailto:jie.dong@huawei.com&gt;&gt;, OSPF=
 WG List</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     &lt;ospf@ietf.org &lt;mailto:ospf@ietf.org&g=
t;&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     *Cc: *&quot;Zhangxudong (zhangxudong, VRP)&q=
uot;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     &lt;zhangxudong@huawei.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     &lt;mailto:zhangxudong@huawei.com&gt;&gt;,</=
p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     &quot;lizhenqiang@chinamobile.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     &lt;mailto:lizhenqiang@chinamobile.com&gt;&q=
uot;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     &lt;lizhenqiang@chinamobile.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     &lt;mailto:lizhenqiang@chinamobile.com&gt;&g=
t;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     *Subject: *Re: [OSPF] Solicit feedbacks on</=
p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     draft-dong-ospf-maxage-flush-problem-stateme=
nt</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                     </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Jie =96</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Having the discussion has certainly been=
 a good</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         thing, but if the consensus of the WG is=
 that</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         there is no protocol change required the=
n there</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         is no need for any draft =96 which is my=
 current</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         position.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         The other point is that you seem to be c=
onfusing</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         the IS-IS Purge origination TLV (RFC 623=
2) with</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         detecting invalid purges/remaining lifet=
ime</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         corruption. This is not the case. RFC 62=
32</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         simply allows us to detect which router<=
/p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         originated a purge =96 it is not able to=
 detect</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         whether a purge is valid/invalid =96 and=
 was not</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         motivated by concerns about remaining li=
fetime</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         corruption.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                             Les</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *From:*Dongjie (Jimmy)</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         [mailto:jie.dong@huawei.com]</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Sent:* Wednesday, August 10, 2016 9:24 =
PM</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *To:* Les Ginsberg (ginsberg); ospf@ietf=
.org</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         &lt;mailto:ospf@ietf.org&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Cc:* Zhangxudong (zhangxudong, VRP);</p=
>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         lizhenqiang@chinamobile.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         &lt;mailto:lizhenqiang@chinamobile.com&g=
t;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Subject:* RE: [OSPF] Solicit feedbacks =
on</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         draft-dong-ospf-maxage-flush-problem-sta=
tement</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Hi Les,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         The current draft is about problem state=
ment, so</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         IMO what the WG needs to consider is whe=
ther</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         this is a vulnerability of OSPF protocol=
, and</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         whether it can have negative impact to t=
he</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         network. If the problem is acknowledged,=
 IMO it</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         is worth to be documented.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         The =93ROI=94 as you mentioned is for th=
e evaluation</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         of the proposed solutions. I totally agr=
ee that</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         for the timer bug case, recognizing and =
ignoring</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         the received abnormal Maxage LSAs cannot=
 stop</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         the misbehaved router from generating fu=
rther</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Maxage LSA, as it is a systematic proble=
m, which</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         can only be fixed after the operator ide=
ntifies</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         that router. This is also similar to the=
</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         systematic corruption of IS-IS remain ti=
me.  And</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         this is why this draft mentions two kind=
s of</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         potential solutions, the mitigation mech=
anism</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         can avoid the network being severely imp=
acted by</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         the problem, while for systematic proble=
ms,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         problem localization is needed to identi=
fy the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         misbehaved router and then solve the pro=
blem.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Best regards,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Jie</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *From:*OSPF [mailto:ospf-bounces@ietf.or=
g] *On</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Behalf Of *Les Ginsberg (ginsberg)</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Sent:* Monday, August 08, 2016 2:14 AM<=
/p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *To:* Dongjie (Jimmy) &lt;jie.dong@huawe=
i.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         &lt;mailto:jie.dong@huawei.com&gt;&gt;; =
ospf@ietf.org</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         &lt;mailto:ospf@ietf.org&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Cc:* Zhangxudong (zhangxudong, VRP)</p>=

<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         &lt;zhangxudong@huawei.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         &lt;mailto:zhangxudong@huawei.com&gt;&gt=
;;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         lizhenqiang@chinamobile.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         &lt;mailto:lizhenqiang@chinamobile.com&g=
t;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Subject:* Re: [OSPF] Solicit feedbacks =
on</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         draft-dong-ospf-maxage-flush-problem-sta=
tement</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Jie =96</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Thinking about the following some more:<=
/p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         /&lt;snip&gt;/</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         /What remains is the possibility that an=
</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         implementation has some bug and unintent=
ionally</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         modifies the age to something other than=
 what it</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         should be due to the actual elapsed time=
 since</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         LSA generation. I suppose a mechanism eq=
uivalent</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         to what the IS-IS draft defined i.e. set=
ting the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         age to =93new=94 (0 in OSPF case) when f=
irst</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         receiving a non-self-generated LSA could=
 be</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         useful to prevent negative impacts of su=
ch an</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         implementation bug. Is this what you int=
end?/</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         //</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         /[Jie]: More specifically, the problem c=
ould be</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         caused by either =93setting the LS age f=
ield</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         incorrectly due to implementation bug=94=
 or</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         =93system timer runs so fast that the LS=
 age</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         reaches MaxAge much earlier than other r=
outers=94.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Another less likely case is that the LS =
age</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         field is corrupted before the LSA is ass=
embled</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         into OSPF packet./</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         /&lt;end snip&gt;/</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         The benefits are extremely limited. If a=
 router</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         prematurely ages an LSA due to a timer b=
ug,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         ignoring the received LSA age on recepti=
on isn=92t</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         going to prevent premature purging by th=
e router</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         which has the bug. So the effect of igno=
ring the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         received LSA age prior to reaching MAXAG=
E will</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         be short lived. You are then left with t=
he</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         possibility that an implementation corru=
pts the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         LSA age BEFORE calculating checksum/cryp=
to</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         authentication =96 but its local timeout=
 logic is</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         unaffected. This has very limited value.=
 Whether</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         the WG considers this worth pursuing is<=
/p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         something you need to ask. For myself, I=
 don=92t</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         see much ROI here.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                            Les</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *From:*Dongjie (Jimmy)</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         [mailto:jie.dong@huawei.com]</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Sent:* Monday, August 01, 2016 9:43 PM<=
/p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *To:* Les Ginsberg (ginsberg); ospf@ietf=
.org</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         &lt;mailto:ospf@ietf.org&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Cc:* Zhangxudong (zhangxudong, VRP);</p=
>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         lizhenqiang@chinamobile.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         &lt;mailto:lizhenqiang@chinamobile.com&g=
t;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Subject:* RE: [OSPF] Solicit feedbacks =
on</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         draft-dong-ospf-maxage-flush-problem-sta=
tement</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Hi Les,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Please see my replies with [Jie2]:</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *From:*Les Ginsberg (ginsberg)</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         [mailto:ginsberg@cisco.com]</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Sent:* Monday, August 01, 2016 9:57 PM<=
/p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *To:* Dongjie (Jimmy); ospf@ietf.org</p>=

<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         &lt;mailto:ospf@ietf.org&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Cc:* Zhangxudong (zhangxudong, VRP);</p=
>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         lizhenqiang@chinamobile.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         &lt;mailto:lizhenqiang@chinamobile.com&g=
t;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Subject:* RE: [OSPF] Solicit feedbacks =
on</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         draft-dong-ospf-maxage-flush-problem-sta=
tement</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Jie -</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *From:*Dongjie (Jimmy)</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         [mailto:jie.dong@huawei.com]</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Sent:* Monday, August 01, 2016 1:44 AM<=
/p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *To:* Les Ginsberg (ginsberg); ospf@ietf=
.org</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         &lt;mailto:ospf@ietf.org&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Cc:* Zhangxudong (zhangxudong, VRP);</p=
>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         lizhenqiang@chinamobile.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         &lt;mailto:lizhenqiang@chinamobile.com&g=
t;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Subject:* RE: [OSPF] Solicit feedbacks =
on</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         draft-dong-ospf-maxage-flush-problem-sta=
tement</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Hi Les,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Please see inline with [Jie]:</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *From:*Les Ginsberg (ginsberg)</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         [mailto:ginsberg@cisco.com]</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Sent:* Monday, August 01, 2016 3:09 PM<=
/p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *To:* Dongjie (Jimmy); ospf@ietf.org</p>=

<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         &lt;mailto:ospf@ietf.org&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Cc:* Zhangxudong (zhangxudong, VRP);</p=
>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         lizhenqiang@chinamobile.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         &lt;mailto:lizhenqiang@chinamobile.com&g=
t;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Subject:* RE: [OSPF] Solicit feedbacks =
on</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         draft-dong-ospf-maxage-flush-problem-sta=
tement</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Jie =96</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Fully agree that IS-IS and OSPF differ i=
n this</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         regard.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         https://www.ietf.org/id/draft-ietf-isis-=
remaining-</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         lifetime-01.txt</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         addresses problems where corruption of t=
he</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         remaining lifetime occurs either during<=
/p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         transmission/reception or due to some DO=
S</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         attack. This isn=92t a concern w OSPF (h=
ope you</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         agree).</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         [Jie]: Yes, for OSPF the corruption duri=
ng</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         packet transmission can be detected.</p>=

<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         What remains is the possibility that an<=
/p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         implementation has some bug and unintent=
ionally</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         modifies the age to something other than=
 what it</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         should be due to the actual elapsed time=
 since</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         LSA generation. I suppose a mechanism eq=
uivalent</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         to what the IS-IS draft defined i.e. set=
ting the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         age to =93new=94 (0 in OSPF case) when f=
irst</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         receiving a non-self-generated LSA could=
 be</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         useful to prevent negative impacts of su=
ch an</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         implementation bug. Is this what you int=
end?</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         [Jie]: More specifically, the problem co=
uld be</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         caused by either =93setting the LS age f=
ield</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         incorrectly due to implementation bug=94=
 or</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         =93system timer runs so fast that the LS=
 age</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         reaches MaxAge much earlier than other r=
outers=94.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Another less likely case is that the LS =
age</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         field is corrupted before the LSA is ass=
embled</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         into OSPF packet.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         [Jie]: Regarding the solutions space, IM=
O we</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         need to consider both cases: =93LS age r=
eaches</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         MaxAge=94 and =93LS age close to MaxAge=94=
. For IS-IS,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         RFC 6232 and RFC 6233 provide solutions =
for the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         detection and identification of corrupte=
d IS-IS</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         purge, while OSPF does not have similar<=
/p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         mechanisms.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         */[Les:] It is incorrect to say that RFC=
 6232</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         makes it possible to detect a corrupt pu=
rge.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         What it does do is to provide an indicat=
ion as</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         to which IS initiated a purge. I don=92t=
 know how</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         OSPF would address this issue, but for O=
SPFv2 at</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         least any solution would likely not be b=
ackwards</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         compatible. For this reason I suggest th=
at you</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         not try to address this issue in the sam=
e draft./*</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *//*</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         [Jie2]: Agreed, RFC 6232 provide the mec=
hanism</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         to track the misbehaved routers so that =
operator</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         can fix the problem, the detection can b=
e based</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         on the rules in RFC 6233 or some other</=
p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         anomalies. Indeed for OSPFv2 legacy LSAs=
, it is</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         difficult to introduce the mechanism sim=
ilar to</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         RFC 6232, while it can be easier for the=
</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         OSPFv2/v3 Extended LSAs. So it depends o=
n how</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         backward compatible the solution should =
be. I</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         agree with you that the solution for Pro=
blem</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Localization in OSPF needs to be provide=
d in a</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         separate document.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *//*</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         */Solutions to LS age  corruption can be=
 done in</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         a backwards compatible way, but they  MU=
ST NOT</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         result in discarding purges which pass</=
p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         authentication- doing so places you at r=
isk for</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         having inconsistent LSDBs in the network=
./*</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         [Jie2]: Exactly. The received MaxAge LSA=
s cannot</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         simply be discarded, the decision must b=
e made</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         carefully, probably based on some additi=
onal</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         information. The authors has discussed s=
ome</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         possible solution internally, and will p=
repare</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         some material for further open discussio=
n.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         As written, the draft makes claims that =
are at</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         least misleading =96 and I believe actua=
lly</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         incorrect. In Section 6 you say:</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         =93The LS age field may be altered as a =
result of</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                             packet corruption, such modification=
 cannot</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         be detected by LSA</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                             checksum nor OSPF packet cryptograph=
ic</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         authentication.=94</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         This isn=92t correct.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         [Jie] Thanks for pointing out this. This=
</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         sentence need to be revised to mention =93=
LSA</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         corruption=94 rather than =93packet corr=
uption=94.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         What would be helpful =96 at least to me=
 =96 is to</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         move from a generic problem statement to=
 the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         specific problem you want to solve and t=
he</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         proposed solution. This also requires yo=
u to</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         more clearly state the cases where there=
 is an</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         actual vulnerability. It would be a lot =
easier</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         to support the draft if this were done.<=
/p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         [Jie] Thanks for your suggestion. Yes we=
 can</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         update this draft with more specific pro=
blem</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         statements as I mentioned above.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         [Jie] As for the proposed solutions, the=
 current</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         draft specifies the requirements on the<=
/p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         potential solutions, from which we envis=
ion that</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         different solutions maybe needed for =93=
Impact</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Mitigation=94 and =93Problem Localizatio=
n=94. The</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         solution for =93Impact mitigation=94 can=
 be the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         easier one, for which we can start to di=
scuss</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         the potential solutions now. While the s=
olution</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         for =93problem localization=94 may need =
more</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         considerations.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         */[Les:] A discussion of the requirement=
s is</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         useful and necessary, but IMO until you =
propose</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         a solution there isn=92t enough substanc=
e for the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         document to become a WG document./*</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         [Jie2] Yes the current draft focuses on =
the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         problem statement and the requirements, =
the goal</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         is to firstly get the MaxAge flush probl=
em</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         acknowledged and reach consensus on the<=
/p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         requirements. Then the plan is to specif=
y the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         solutions in separate documents.  Your v=
aluable</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         suggestions will be considered, and furt=
her</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         contributions are welcome.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Best regards,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Jie</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *//*</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         */    Les/*</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Best regards,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Jie</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                             Les</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *From:*Dongjie (Jimmy)</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         [mailto:jie.dong@huawei.com]</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Sent:* Sunday, July 31, 2016 11:48 PM</=
p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *To:* Les Ginsberg (ginsberg); ospf@ietf=
.org</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         &lt;mailto:ospf@ietf.org&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Cc:* Zhangxudong (zhangxudong, VRP);</p=
>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         lizhenqiang@chinamobile.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         &lt;mailto:lizhenqiang@chinamobile.com&g=
t;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Subject:* RE: [OSPF] Solicit feedbacks =
on</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         draft-dong-ospf-maxage-flush-problem-sta=
tement</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Hi Les,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Thanks for your comments.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         OSPF packet level checksum and authentic=
ation</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         can only protect the assembled LSU packe=
t one</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         hop on the wire, while cannot detect any=
 change</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         to LSA made by the routers. This is beca=
use the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         OSPF packets are re-assembled on each ho=
p, which</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         is slightly different from IS-IS. So the=
 problem</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         for OSPF is mainly due to the problems i=
nside</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         the router, for example protocol</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         implementations, system timers, or some =
hardware</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         problem. Actually this problem has been =
seen in</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         several production networks.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         We can improve the description in the dr=
aft to</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         make this clear.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Best regards,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Jie</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *From:*Les Ginsberg (ginsberg)</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         [mailto:ginsberg@cisco.com]</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Sent:* Monday, August 01, 2016 1:30 PM<=
/p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *To:* Dongjie (Jimmy); ospf@ietf.org</p>=

<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         &lt;mailto:ospf@ietf.org&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Cc:* Zhangxudong (zhangxudong, VRP);</p=
>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         lizhenqiang@chinamobile.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         &lt;mailto:lizhenqiang@chinamobile.com&g=
t;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Subject:* RE: [OSPF] Solicit feedbacks =
on</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         draft-dong-ospf-maxage-flush-problem-sta=
tement</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Jie =96</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         The draft says (Section 2):</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         =93Since cryptographic authentication is=
 executed</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         at the OSPF packet</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                             level, it can only protect the assem=
bled LSU</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         packet for one hop and</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                             does not provide any additional prot=
ection</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         for the corruption of LS</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                             age field.=94</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         But as authentication is calculated at t=
he OSPF</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         packet level, any change to the LS age f=
ield for</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         an individual LSA contained within the O=
SPF</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         packet (e.g. by some packet corruption i=
n</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         transmission) would cause authentication=
 to fail</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         when the packet is received. So the stat=
ement</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         you make is not correct. I therefore am<=
/p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         struggling to understand what problem yo=
u</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         believe is not addressed by existing</p>=

<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         authentication techniques.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                             Les</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *From:*OSPF [mailto:ospf-bounces@ietf.or=
g] *On</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Behalf Of *Dongjie (Jimmy)</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Sent:* Sunday, July 31, 2016 8:15 PM</p=
>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *To:* ospf@ietf.org &lt;mailto:ospf@ietf=
.org&gt;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Cc:* Zhangxudong (zhangxudong, VRP);</p=
>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         lizhenqiang@chinamobile.com</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         &lt;mailto:lizhenqiang@chinamobile.com&g=
t;</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         *Subject:* [OSPF] Solicit feedbacks on</=
p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         draft-dong-ospf-maxage-flush-problem-sta=
tement</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Hi all,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         draft-dong-ospf-maxage-flush-problem-sta=
tement</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         describes the problems caused by the cor=
ruption</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         of the LS Age field, and summarizes the<=
/p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         requirements on potential solutions. Thi=
s draft</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         received good comments during the presen=
tation</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         on the IETF meeting in B.A.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         The authors would like to solicit furthe=
r</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         feedbacks from the mailing list, on both=
 the</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         problem statement and the solution requi=
rements.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Based on the feedbacks, we will update t=
he</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         problem statement draft, and work togeth=
er to</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         build suitable solutions.</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         The URL of the draft is:</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         https://tools.ietf.org/html/draft-dong-o=
spf-maxage</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         -flush-problem-statement-00</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Comments &amp; feedbacks are welcome.</p=
>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Best regards,</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt;                         Jie</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; _______________________________________________</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; OSPF mailing list</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; OSPF@ietf.org</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; &gt; https://www.ietf.org/mailman/listinfo/ospf</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; </p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; _______________________________________________</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; OSPF mailing list</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; OSPF@ietf.org</p>
<p style=3D" margin-top:0px; margin-bottom:0px; margin-left:0px; margin=
-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">&gt=
; https://www.ietf.org/mailman/listinfo/ospf</p>
<p style=3D"-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px=
; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0p=
x; ">&nbsp;</p></body></html>
--nextPart2074808.IN16zJ3MyM--


From nobody Wed Oct 12 15:39:45 2016
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Stephen Farrell has entered the following ballot position for
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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------


abstract: the text doesn't really explain anything to me.  But
then I'm not familiar with OSPF so maybe it's obvious to
someone who is.

intro: expanding LSA, VPLS etc on 1st use would be better.

3.1, 2nd bullet: the text here was very unclear to me

(All that said, the satellite/mobile ground station example 
does enough to ensure that the overall document is clear
so the above are nitty nits:-)



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From nobody Thu Oct 13 01:32:46 2016
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Open Shortest Path First IGP of the IETF.

        Title           : Advertising Tunnelling Capability in OSPF
        Authors         : Xiaohu Xu
                          Bruno Decraene 
                          Robert Raszuk
                          Uma Chunduri
                          Luis M. Contreras
                          Luay Jalil
	Filename        : draft-ietf-ospf-encapsulation-cap-01.txt
	Pages           : 11
	Date            : 2016-10-13

Abstract:
   Some networks use tunnels for a variety of reasons.  A large variety
   of tunnel types are defined and the ingress needs to select a type of
   tunnel which is supported by the egress.  This document defines how
   to advertise egress tunnel capabilities in OSPF Router Information.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ospf-encapsulation-cap/

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https://tools.ietf.org/html/draft-ietf-ospf-encapsulation-cap-01

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https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-encapsulation-cap-01


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ftp://ftp.ietf.org/internet-drafts/


From nobody Thu Oct 13 02:40:30 2016
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Alexey Melnikov has entered the following ballot position for
draft-ietf-ospf-two-part-metric-09: No Objection

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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Sorry for being dense, but:

3.2.  Advertising Network-to-Router Metric in OSPFv2

   For OSPFv2, the Network-to-Router metric is encoded in an OSPF
   Extended Link TLV Sub-TLV [RFC7684], defined in this document as the
   Network-to-Router Metric Sub-TLV.  The type of the Sub-TLV is TBD2.
   The length of the Sub-TLV is 4 (for the value part only).  The value
   part of the Sub-TLV is defined as follows:

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |      MT       |        0      |          MT   metric          |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

I don't believe the document explains what are valid values of the MT
field. Help?



From nobody Thu Oct 13 06:46:31 2016
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Subject: Re: [OSPF] Alexey Melnikov's No Objection on draft-ietf-ospf-two-part-metric-09: (with COMMENT)
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From nobody Thu Oct 13 06:59:34 2016
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From: Alexey Melnikov <aamelnikov@fastmail.fm>
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Cc: ospf@ietf.org, ospf-chairs@ietf.org, draft-ietf-ospf-two-part-metric@ietf.org
Subject: Re: [OSPF] Alexey Melnikov's No Objection on draft-ietf-ospf-two-part-metric-09: (with COMMENT)
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Hi,

On Thu, Oct 13, 2016, at 02:46 PM, Acee Lindem (acee) wrote:
> Hi Alexey, 
> 
> On 10/13/16, 5:40 AM, "Alexey Melnikov" <aamelnikov@fastmail.fm> wrote:
> 
> >Alexey Melnikov has entered the following ballot position for
> >draft-ietf-ospf-two-part-metric-09: No Objection
> >
> >When responding, please keep the subject line intact and reply to all
> >email addresses included in the To and CC lines. (Feel free to cut this
> >introductory paragraph, however.)
> >
> >
> >Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
> >for more information about IESG DISCUSS and COMMENT positions.
> >
> >
> >The document, along with other ballot positions, can be found here:
> >https://datatracker.ietf.org/doc/draft-ietf-ospf-two-part-metric/
> >
> >
> >
> >----------------------------------------------------------------------
> >COMMENT:
> >----------------------------------------------------------------------
> >
> >Sorry for being dense, but:
> 
> You are not dense at all as this could be better referenced.
> 
> >
> >3.2.  Advertising Network-to-Router Metric in OSPFv2
> >
> >   For OSPFv2, the Network-to-Router metric is encoded in an OSPF
> >   Extended Link TLV Sub-TLV [RFC7684], defined in this document as the
> >   Network-to-Router Metric Sub-TLV.  The type of the Sub-TLV is TBD2.
> >   The length of the Sub-TLV is 4 (for the value part only).  The value
> >   part of the Sub-TLV is defined as follows:
> >
> >       0                   1                   2                   3
> >       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
> >      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >      |      MT       |        0      |          MT   metric          |
> >      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >
> >I don't believe the document explains what are valid values of the MT
> >field. Help?
> 
> It is defined in the reference in the next sentence.
> 
>   Multiple such Sub-TLVs can exist in a single OSPF Extended Link TLV,
>   one for each topology [RFC4915].
> 
> 
> We will change the MT to MT-ID in the first figure field and add:
> 
> Each Sub-TLV will have a unique Multi-Topology Identifier and will adhere
> to the advertisement rules defined in section 3.4 or [RFC 4915].

That would be an improvement, thank you. Although I would use "MT-ID
(Multi-Topology Identifier)", so that one can figure out from the ASCII
art that you are talking about the same thing.

Best Regards,
Alexey


From nobody Thu Oct 13 07:02:06 2016
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Alexey Melnikov <aamelnikov@fastmail.fm>, The IESG <iesg@ietf.org>
Thread-Topic: Alexey Melnikov's No Objection on draft-ietf-ospf-two-part-metric-09: (with COMMENT)
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Subject: Re: [OSPF] Alexey Melnikov's No Objection on draft-ietf-ospf-two-part-metric-09: (with COMMENT)
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From: Alia Atlas <akatlas@gmail.com>
Date: Thu, 13 Oct 2016 10:18:52 -0400
Message-ID: <CAG4d1rfUXF2cH3SHRp4Kgqk0vsAv6Z+a7AaP5egvhitq=2e3sw@mail.gmail.com>
To: "Acee Lindem (acee)" <acee@cisco.com>
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Cc: "ospf@ietf.org" <ospf@ietf.org>, "draft-ietf-ospf-two-part-metric@ietf.org" <draft-ietf-ospf-two-part-metric@ietf.org>, "ospf-chairs@ietf.org" <ospf-chairs@ietf.org>, The IESG <iesg@ietf.org>, Alexey Melnikov <aamelnikov@fastmail.fm>
Subject: Re: [OSPF] Alexey Melnikov's No Objection on draft-ietf-ospf-two-part-metric-09: (with COMMENT)
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Acee, Jeffrey, and Lili,

If you could please submit a new version ASAP with this change and removing
the update to 5340, then
this draft is approved and we can move it to the RFC Editor.

Thanks & good work,
Alia

On Thu, Oct 13, 2016 at 10:01 AM, Acee Lindem (acee) <acee@cisco.com> wrote=
:

>
> Hi Alexey,
>
> On 10/13/16, 9:59 AM, "Alexey Melnikov" <aamelnikov@fastmail.fm> wrote:
>
> >Hi,
> >
> >On Thu, Oct 13, 2016, at 02:46 PM, Acee Lindem (acee) wrote:
> >> Hi Alexey,
> >>
> >> On 10/13/16, 5:40 AM, "Alexey Melnikov" <aamelnikov@fastmail.fm> wrote=
:
> >>
> >> >Alexey Melnikov has entered the following ballot position for
> >> >draft-ietf-ospf-two-part-metric-09: No Objection
> >> >
> >> >When responding, please keep the subject line intact and reply to all
> >> >email addresses included in the To and CC lines. (Feel free to cut th=
is
> >> >introductory paragraph, however.)
> >> >
> >> >
> >> >Please refer to
> >>https://www.ietf.org/iesg/statement/discuss-criteria.html
> >> >for more information about IESG DISCUSS and COMMENT positions.
> >> >
> >> >
> >> >The document, along with other ballot positions, can be found here:
> >> >https://datatracker.ietf.org/doc/draft-ietf-ospf-two-part-metric/
> >> >
> >> >
> >> >
> >> >---------------------------------------------------------------------=
-
> >> >COMMENT:
> >> >---------------------------------------------------------------------=
-
> >> >
> >> >Sorry for being dense, but:
> >>
> >> You are not dense at all as this could be better referenced.
> >>
> >> >
> >> >3.2.  Advertising Network-to-Router Metric in OSPFv2
> >> >
> >> >   For OSPFv2, the Network-to-Router metric is encoded in an OSPF
> >> >   Extended Link TLV Sub-TLV [RFC7684], defined in this document as t=
he
> >> >   Network-to-Router Metric Sub-TLV.  The type of the Sub-TLV is TBD2=
.
> >> >   The length of the Sub-TLV is 4 (for the value part only).  The val=
ue
> >> >   part of the Sub-TLV is defined as follows:
> >> >
> >> >       0                   1                   2                   3
> >> >       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 =
1
> >> >      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
> +-+-+
> >> >      |      MT       |        0      |          MT   metric         =
 |
> >> >      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
> +-+-+
> >> >
> >> >I don't believe the document explains what are valid values of the MT
> >> >field. Help?
> >>
> >> It is defined in the reference in the next sentence.
> >>
> >>   Multiple such Sub-TLVs can exist in a single OSPF Extended Link TLV,
> >>   one for each topology [RFC4915].
> >>
> >>
> >> We will change the MT to MT-ID in the first figure field and add:
> >>
> >> Each Sub-TLV will have a unique Multi-Topology Identifier and will
> >>adhere
> >> to the advertisement rules defined in section 3.4 or [RFC 4915].
> >
> >That would be an improvement, thank you. Although I would use "MT-ID
> >(Multi-Topology Identifier)", so that one can figure out from the ASCII
> >art that you are talking about the same thing.
>
> Right - We=E2=80=99ll include the acronym =E2=80=9CMulti-Topology Identif=
ier (MT-ID)=E2=80=9D.
>
> Thanks,
> Acee
>
>
>
> >
> >Best Regards,
> >Alexey
>
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf
>

--001a1141c1421557fc053ebfca65
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<div dir=3D"ltr">Acee, Jeffrey, and Lili,<div><br></div><div>If you could p=
lease submit a new version ASAP with this change and removing the update to=
 5340, then</div><div>this draft is approved and we can move it to the RFC =
Editor.</div><div><br></div><div>Thanks &amp; good work,</div><div>Alia</di=
v></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Thu, O=
ct 13, 2016 at 10:01 AM, Acee Lindem (acee) <span dir=3D"ltr">&lt;<a href=
=3D"mailto:acee@cisco.com" target=3D"_blank">acee@cisco.com</a>&gt;</span> =
wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bord=
er-left:1px #ccc solid;padding-left:1ex"><br>
Hi Alexey,<br>
<div><div class=3D"h5"><br>
On 10/13/16, 9:59 AM, &quot;Alexey Melnikov&quot; &lt;<a href=3D"mailto:aam=
elnikov@fastmail.fm">aamelnikov@fastmail.fm</a>&gt; wrote:<br>
<br>
&gt;Hi,<br>
&gt;<br>
&gt;On Thu, Oct 13, 2016, at 02:46 PM, Acee Lindem (acee) wrote:<br>
&gt;&gt; Hi Alexey,<br>
&gt;&gt;<br>
&gt;&gt; On 10/13/16, 5:40 AM, &quot;Alexey Melnikov&quot; &lt;<a href=3D"m=
ailto:aamelnikov@fastmail.fm">aamelnikov@fastmail.fm</a>&gt; wrote:<br>
&gt;&gt;<br>
&gt;&gt; &gt;Alexey Melnikov has entered the following ballot position for<=
br>
&gt;&gt; &gt;draft-ietf-ospf-two-part-<wbr>metric-09: No Objection<br>
&gt;&gt; &gt;<br>
&gt;&gt; &gt;When responding, please keep the subject line intact and reply=
 to all<br>
&gt;&gt; &gt;email addresses included in the To and CC lines. (Feel free to=
 cut this<br>
&gt;&gt; &gt;introductory paragraph, however.)<br>
&gt;&gt; &gt;<br>
&gt;&gt; &gt;<br>
&gt;&gt; &gt;Please refer to<br>
&gt;&gt;<a href=3D"https://www.ietf.org/iesg/statement/discuss-criteria.htm=
l" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/iesg/<wbr>stat=
ement/discuss-criteria.<wbr>html</a><br>
&gt;&gt; &gt;for more information about IESG DISCUSS and COMMENT positions.=
<br>
&gt;&gt; &gt;<br>
&gt;&gt; &gt;<br>
&gt;&gt; &gt;The document, along with other ballot positions, can be found =
here:<br>
&gt;&gt; &gt;<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-ospf-tw=
o-part-metric/" rel=3D"noreferrer" target=3D"_blank">https://datatracker.ie=
tf.org/<wbr>doc/draft-ietf-ospf-two-part-<wbr>metric/</a><br>
&gt;&gt; &gt;<br>
&gt;&gt; &gt;<br>
&gt;&gt; &gt;<br>
&gt;&gt; &gt;-----------------------------<wbr>----------------------------=
--<wbr>-----------<br>
&gt;&gt; &gt;COMMENT:<br>
&gt;&gt; &gt;-----------------------------<wbr>----------------------------=
--<wbr>-----------<br>
&gt;&gt; &gt;<br>
&gt;&gt; &gt;Sorry for being dense, but:<br>
&gt;&gt;<br>
&gt;&gt; You are not dense at all as this could be better referenced.<br>
&gt;&gt;<br>
&gt;&gt; &gt;<br>
&gt;&gt; &gt;3.2.=C2=A0 Advertising Network-to-Router Metric in OSPFv2<br>
&gt;&gt; &gt;<br>
&gt;&gt; &gt;=C2=A0 =C2=A0For OSPFv2, the Network-to-Router metric is encod=
ed in an OSPF<br>
&gt;&gt; &gt;=C2=A0 =C2=A0Extended Link TLV Sub-TLV [RFC7684], defined in t=
his document as the<br>
&gt;&gt; &gt;=C2=A0 =C2=A0Network-to-Router Metric Sub-TLV.=C2=A0 The type =
of the Sub-TLV is TBD2.<br>
&gt;&gt; &gt;=C2=A0 =C2=A0The length of the Sub-TLV is 4 (for the value par=
t only).=C2=A0 The value<br>
&gt;&gt; &gt;=C2=A0 =C2=A0part of the Sub-TLV is defined as follows:<br>
&gt;&gt; &gt;<br>
&gt;&gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A00=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A01=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A02=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A03<br>
&gt;&gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A00 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7=
 8 9 0 1 2 3 4 5 6 7 8 9 0 1<br>
&gt;&gt; &gt;=C2=A0 =C2=A0 =C2=A0 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-<wbr>+-+-+-=
+-+-+-+-+-+-+-+-+-+-+-+-<wbr>+-+-+<br>
&gt;&gt; &gt;=C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 MT=C2=A0 =C2=A0 =C2=
=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 0=C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 MT=C2=A0 =C2=A0metric=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 |<br>
&gt;&gt; &gt;=C2=A0 =C2=A0 =C2=A0 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-<wbr>+-+-+-=
+-+-+-+-+-+-+-+-+-+-+-+-<wbr>+-+-+<br>
&gt;&gt; &gt;<br>
&gt;&gt; &gt;I don&#39;t believe the document explains what are valid value=
s of the MT<br>
&gt;&gt; &gt;field. Help?<br>
&gt;&gt;<br>
&gt;&gt; It is defined in the reference in the next sentence.<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0Multiple such Sub-TLVs can exist in a single OSPF Exte=
nded Link TLV,<br>
&gt;&gt;=C2=A0 =C2=A0one for each topology [RFC4915].<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; We will change the MT to MT-ID in the first figure field and add:<=
br>
&gt;&gt;<br>
&gt;&gt; Each Sub-TLV will have a unique Multi-Topology Identifier and will=
<br>
&gt;&gt;adhere<br>
&gt;&gt; to the advertisement rules defined in section 3.4 or [RFC 4915].<b=
r>
&gt;<br>
&gt;That would be an improvement, thank you. Although I would use &quot;MT-=
ID<br>
&gt;(Multi-Topology Identifier)&quot;, so that one can figure out from the =
ASCII<br>
&gt;art that you are talking about the same thing.<br>
<br>
</div></div>Right - We=E2=80=99ll include the acronym =E2=80=9CMulti-Topolo=
gy Identifier (MT-ID)=E2=80=9D.<br>
<br>
Thanks,<br>
Acee<br>
<div class=3D"HOEnZb"><div class=3D"h5"><br>
<br>
<br>
&gt;<br>
&gt;Best Regards,<br>
&gt;Alexey<br>
<br>
______________________________<wbr>_________________<br>
OSPF mailing list<br>
<a href=3D"mailto:OSPF@ietf.org">OSPF@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/ospf" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/<wbr>listinfo/ospf</a><br>
</div></div></blockquote></div><br></div>

--001a1141c1421557fc053ebfca65--


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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Open Shortest Path First IGP of the IETF.

        Title           : OSPF Two-part Metric
        Authors         : Zhaohui Zhang
                          Lili Wang
                          Acee Lindem
	Filename        : draft-ietf-ospf-two-part-metric-10.txt
	Pages           : 9
	Date            : 2016-10-13

Abstract:
   This document specifies an optional OSPF protocol extension to
   represent router metrics in a multi-access network in two parts: the
   metric from the router to the network and the metric from the network
   to the router.  For such networks, the router to router metric for
   OSPF route computation is the sum of the two parts.  This document
   updates RFC 2328.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ospf-two-part-metric/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-ospf-two-part-metric-10

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-two-part-metric-10


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


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c2NyaWJlcyB0aGUgcHJvYmxlbXMgY2F1c2VkIGJ5IHRoZSBjb3JydXB0aW9uIG9mIHRoZSBMUyBB
Z2UgZmllbGQsIGFuZCBzdW1tYXJpemVzIHRoZSByZXF1aXJlbWVudHMgb24gcG90ZW50aWFsIHNv
bHV0aW9ucy4gVGhpcyBkcmFmdCByZWNlaXZlZCBnb29kIGNvbW1lbnRzIGR1cmluZyB0aGUgcHJl
c2VudGF0aW9uIG9uIHRoZSBJRVRGIG1lZXRpbmcgaW4gQi5BLg0KIA0KVGhlIGF1dGhvcnMgd291
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LA0KSmllDQogDQo=

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	charset="UTF-8"
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charse=
t=3DUTF-8"><style>body { line-height: 1.5; }blockquote { margin-top: 0px; =
margin-bottom: 0px; margin-left: 0.5em; }p { margin-top: 0px; margin-botto=
m: 0px; }div.foxdiv20161014114204472192 { word-wrap: break-word; -webkit-l=
ine-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-f=
amily: CALIBRI, sans-serif; }body { font-size: 10.5pt; font-family: =E5=BE=
=AE=E8=BD=AF=E9=9B=85=E9=BB=91; color: rgb(0, 0, 0); line-height: 1.5; }</=
style></head><body>=0A<div>Speaking as a co-author from network operator,<=
/div><div><br></div><div><span></span>After the discussion we have reached=
 the common point listed in my previous mail. Put it here again.</div>=0A<=
div><span style=3D"font-family: CALIBRI, sans-serif;">Production network r=
unning OSPF DOES have some problems due to software implementation bugs or=
 hardware defects. Those production network problems deserve some proposal=
s both to identify the router with bugs and to mitigate the problem, for e=
xample to reduce th impact of OSPF route flapping.</span></div><div><span =
style=3D"font-family: CALIBRI, sans-serif;">We are responsible for the net=
work to run robustly, not for the router with bugs.</span></div><div><span=
 style=3D"font-family: CALIBRI, sans-serif;"><br></span></div><div><span s=
tyle=3D"font-family: CALIBRI, sans-serif;">So, I support this doc to be ad=
opted.</span></div><div><span style=3D"font-family: CALIBRI, sans-serif;">=
<br></span></div><hr style=3D"width: 210px; height: 1px;" color=3D"#b5c4df=
" size=3D"1" align=3D"left">=0A<div><span><div style=3D"MARGIN: 10px; FONT=
-FAMILY: verdana; FONT-SIZE: 10pt"><div>lizhenqiang@chinamobile.com</div><=
/div></span></div>=0A<blockquote style=3D"margin-top: 0px; margin-bottom: =
0px; margin-left: 0.5em;"><div>&nbsp;</div><div style=3D"border:none;borde=
r-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm"><div style=3D"PADDING=
-RIGHT: 8px; PADDING-LEFT: 8px; FONT-SIZE: 12px;FONT-FAMILY:tahoma;COLOR:#=
000000; BACKGROUND: #efefef; PADDING-BOTTOM: 8px; PADDING-TOP: 8px"><div><=
b>From:</b>&nbsp;<a href=3D"mailto:acee@cisco.com">Acee Lindem (acee)</a><=
/div><div><b>Date:</b>&nbsp;2016-10-12&nbsp;02:51</div><div><b>To:</b>&nbs=
p;<a href=3D"mailto:ospf@ietf.org">OSPF WG List</a></div><div><b>Subject:<=
/b>&nbsp;[OSPF] FW: Solicit feedbacks on draft-dong-ospf-maxage-flush-prob=
lem-statement</div></div></div><div><div class=3D"FoxDiv201610141142044721=
92">=0A<div>Speaking as WG Co-Chair:</div>=0A<div><br>=0A</div>=0A<div>We =
had a quite a lengthy discussion on this problem and whether or it is some=
thing the WG should adopt. Please indicate whether or not you would suppor=
t WG adoption before Oct 26th, 2016. &nbsp;</div>=0A<div><br>=0A</div>=0A<=
div>Thanks,</div>=0A<div>Acee&nbsp;</div>=0A<div><br>=0A</div>=0A<span id=
=3D"OLK_SRC_BODY_SECTION">=0A<div style=3D"font-family:Calibri; font-size:=
11pt; text-align:left; color:black; BORDER-BOTTOM: medium none; BORDER-LEF=
T: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in=
; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3=
pt">=0A<span style=3D"font-weight:bold">From: </span>"<a href=3D"mailto:li=
zhenqiang@chinamobile.com">lizhenqiang@chinamobile.com</a>" &lt;<a href=3D=
"mailto:lizhenqiang@chinamobile.com">lizhenqiang@chinamobile.com</a>&gt;<b=
r>=0A<span style=3D"font-weight:bold">Date: </span>Thursday, August 25, 20=
16 at 9:29 PM<br>=0A<span style=3D"font-weight:bold">To: </span>Acee Linde=
m &lt;<a href=3D"mailto:acee@cisco.com">acee@cisco.com</a>&gt;, Jie Dong &=
lt;<a href=3D"mailto:jie.dong@huawei.com">jie.dong@huawei.com</a>&gt;, "Le=
s Ginsberg (ginsberg)" &lt;<a href=3D"mailto:ginsberg@cisco.com">ginsberg@=
cisco.com</a>&gt;,=0A OSPF WG List &lt;<a href=3D"mailto:ospf@ietf.org">os=
pf@ietf.org</a>&gt;<br>=0A<span style=3D"font-weight:bold">Cc: </span>"Zha=
ngxudong (zhangxudong, VRP)" &lt;<a href=3D"mailto:zhangxudong@huawei.com"=
>zhangxudong@huawei.com</a>&gt;<br>=0A<span style=3D"font-weight:bold">Sub=
ject: </span>Re: Re: [OSPF] Solicit feedbacks on draft-dong-ospf-maxage-fl=
ush-problem-statement<br>=0A</div>=0A<div><br>=0A</div>=0A<blockquote id=
=3D"MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE" style=3D"border-left-color: rgb(18=
1, 196, 223); border-left-width: 5px; border-left-style: solid; padding: 0=
px 0px 0px 5px; margin: 0px 0px 0px 0.5em;">=0A<div>=0A<div>=0A<div><span>=
</span>Hi Acee,</div>=0A<div><br>=0A</div>=0A<div>Totally agree with you t=
hat we have to avoid significant modification to OSPF.&nbsp;</div>=0A<div>=
<br>=0A</div>=0A<div>The common point after the mail discussion is product=
ion network running OSPF DOES have some problems due to software implement=
ation bugs or hardware defects. Those production network problems deserve =
some proposals both to identify the router with bugs=0A and to mitigate th=
e problem, for example to reduce th impact of OSPF route flapping.</div>=
=0A<div><br>=0A</div>=0A<div>Your suggestion is one option about defective=
 router identification. Thank you very much.</div>=0A<div><br>=0A</div>=0A=
<div>Best Regards,</div>=0A<hr style=3D"width: 210px; height: 1px;" color=
=3D"#b5c4df" size=3D"1" align=3D"left">=0A<div><span>=0A<div style=3D"MARG=
IN: 10px; FONT-FAMILY: verdana; FONT-SIZE: 10pt">=0A<div><a href=3D"mailto=
:lizhenqiang@chinamobile.com">lizhenqiang@chinamobile.com</a></div>=0A</di=
v>=0A</span></div>=0A<blockquote style=3D"margin-top: 0px; margin-bottom: =
0px; margin-left: 0.5em;">=0A<div>&nbsp;</div>=0A<div style=3D"border:none=
;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">=0A<div style=
=3D"PADDING-RIGHT: 8px; PADDING-LEFT: 8px; FONT-SIZE: 12px;FONT-FAMILY:tah=
oma;COLOR:#000000; BACKGROUND: #efefef; PADDING-BOTTOM: 8px; PADDING-TOP: =
8px">=0A<div><b>From:</b>&nbsp;<a href=3D"mailto:acee@cisco.com">Acee Lind=
em (acee)</a></div>=0A<div><b>Date:</b>&nbsp;2016-08-25&nbsp;03:04</div>=
=0A<div><b>To:</b>&nbsp;<a href=3D"mailto:lizhenqiang@chinamobile.com">liz=
henqiang@chinamobile.com</a>;=0A<a href=3D"mailto:jie.dong@huawei.com">Don=
gjie (Jimmy)</a>; <a href=3D"mailto:ginsberg@cisco.com">=0ALes Ginsberg (g=
insberg)</a>; <a href=3D"mailto:ospf@ietf.org">ospf@ietf.org</a></div>=0A<=
div><b>CC:</b>&nbsp;<a href=3D"mailto:zhangxudong@huawei.com">Zhangxudong =
(zhangxudong, VRP)</a></div>=0A<div><b>Subject:</b>&nbsp;Re: [OSPF] Solici=
t feedbacks on draft-dong-ospf-maxage-flush-problem-statement</div>=0A</di=
v>=0A</div>=0A<div>=0A<div class=3D"FoxDiv20160826090955224101" style=3D"w=
ord-wrap: break-word; -webkit-line-break: after-white-space; color: rgb(0,=
 0, 0); font-size: 14px; font-family: CALIBRI, sans-serif;">=0A<div>Speaki=
ng as WG member:</div>=0A<div><br>=0A</div>=0A<div>Hi&nbsp;Zhenjiang,</div=
>=0A<div><br>=0A</div>=0A<div>I don=E2=80=99t doubt that this was a very d=
isquieting experience. However, I still don=E2=80=99t think we should atte=
mpt to change the protocol to compensate for routers that do not adhere to=
 the protocol. To make an analogy, in my years of OSPF experience I=E2=80=
=99ve been=0A subject to a number of bugs related to OSPF=E2=80=99s usage =
of local wire multicast (some triggered by obscure conditions such as rout=
ing and bridging on the same port). However, I=E2=80=99ve never proposed t=
o not use local wire multicast. Also, after 25 years of OSPFv2,=0A it does=
n=E2=80=99t make sense to try and change the protocol to avoid bugs in thi=
s area. As for identifying the nefarious router, I think adding a counter =
and possibly a separate notification to the YANG model might be warranted =
since purging a non-self-originated=0A LSA should not be a common occurren=
ce in most networks.&nbsp;</div>=0A<div><br>=0A</div>=0A<div>Thanks,&nbsp;=
</div>=0A<div>Acee</div>=0A<div>P.S. Since this is an OSPF standards list,=
 I=E2=80=99ve purposely avoided the questions as to how this catastrophic =
bug made it into a production network.&nbsp;</div>=0A<div><br>=0A</div>=0A=
<div><br>=0A</div>=0A<span id=3D"OLK_SRC_BODY_SECTION">=0A<div style=3D"fo=
nt-family:Calibri; font-size:11pt; text-align:left; color:black; BORDER-BO=
TTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-=
LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT=
: medium none; PADDING-TOP: 3pt">=0A<span style=3D"font-weight:bold">From:=
 </span>"<a href=3D"mailto:lizhenqiang@chinamobile.com">lizhenqiang@chinam=
obile.com</a>" &lt;<a href=3D"mailto:lizhenqiang@chinamobile.com">lizhenqi=
ang@chinamobile.com</a>&gt;<br>=0A<span style=3D"font-weight:bold">Date: <=
/span>Wednesday, August 24, 2016 at 2:11 PM<br>=0A<span style=3D"font-weig=
ht:bold">To: </span>Jie Dong &lt;<a href=3D"mailto:jie.dong@huawei.com">ji=
e.dong@huawei.com</a>&gt;, Acee Lindem &lt;<a href=3D"mailto:acee@cisco.co=
m">acee@cisco.com</a>&gt;, "Les Ginsberg (ginsberg)" &lt;<a href=3D"mailto=
:ginsberg@cisco.com">ginsberg@cisco.com</a>&gt;,=0A OSPF WG List &lt;<a hr=
ef=3D"mailto:ospf@ietf.org">ospf@ietf.org</a>&gt;<br>=0A<span style=3D"fon=
t-weight:bold">Cc: </span>"Zhangxudong (zhangxudong, VRP)" &lt;<a href=3D"=
mailto:zhangxudong@huawei.com">zhangxudong@huawei.com</a>&gt;<br>=0A<span =
style=3D"font-weight:bold">Subject: </span>Re: RE: [OSPF] Solicit feedback=
s on draft-dong-ospf-maxage-flush-problem-statement<br>=0A</div>=0A<div><b=
r>=0A</div>=0A<blockquote id=3D"MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE" style=
=3D"border-left-color: rgb(181, 196, 223); border-left-width: 5px; border-=
left-style: solid; padding: 0px 0px 0px 5px; margin: 0px 0px 0px 0.5em;">=
=0A<div>=0A<div><!--[if gte mso 9]><xml>=0A<o:shapedefaults v:ext=3D"edit"=
 spidmax=3D"1026" ></o:shapedefaults>=0A</xml><![endif]--><!--[if gte mso =
9]><xml>=0A<o:shapelayout v:ext=3D"edit">=0A<o:idmap v:ext=3D"edit" data=
=3D"1" ></o:idmap>=0A</o:shapelayout></xml><![endif]-->=0A<div><span></spa=
n>Hello Jie, Acee and Les,</div>=0A<div><br>=0A</div>=0A<div>I am a coauth=
or of this draft from operator China Mobile. Thank you all for your discus=
sion and suggestion in the previous mails. As you all discussed, a misbeha=
vior OSPF router (due to software or hardware problem) can cause severe pr=
oblem in the whole=0A OSPF domain.&nbsp;</div>=0A<div><br>=0A</div>=0A<div=
>Here I want to point out that OSPF route flapping DID occour in my field =
network contributed by&nbsp;<span style=3D"font-size: 10.5pt; line-height:=
 1.5; background-color: window;">a misbehavior OSPF router installed. The =
procedure to analyze and look for the=0A cause were very complicated becau=
se we did not know the source of the flushing. Two hours past, we could no=
t identify the real cause and restore our network. The CPU utilization of =
OSPF routers was high, the network traffic decreased significantly, lots o=
f=0A tunnel down warnings raised. When we tried to shutdown one</span><spa=
n style=3D"font-size: 10.5pt; line-height: 1.5; background-color: window;"=
>&nbsp;OSPF router, route flapping stopped. This router was a newly deploy=
ed one. Through communication with our vendor,=0A they admitted that this =
product had some defects in dealing with OSPF protocol. This kind of defec=
ts are difficult for us to test &nbsp;when they apply for entrance in our =
network. Once defective products are deployed in the field network, &nbsp;=
locating the problem=0A is very hard and time consuming.&nbsp;</span></div=
>=0A<div><span style=3D"font-size: 10.5pt; line-height: 1.5; background-co=
lor: window;"><br>=0A</span></div>=0A<div><span style=3D"font-size: 10.5pt=
; line-height: 1.5; background-color: window;">So, I&nbsp;</span><span spa=
ce=3D"0| " right-pos=3D"76|183" left-pos=3D"76|183" style=3D"font-size: 10=
.5pt; line-height: 1.5; background-color: window;">think it is necessary f=
or us to solve=0A the problem and improve the robustness of the protocol.<=
/span><span class=3D"high-light-bg" space=3D"0| " right-pos=3D"259|51" lef=
t-pos=3D"259|51" style=3D"font-size: 10.5pt; line-height: 1.5; background-=
color: window;"> At least it should provide the means to help=0A us locate=
 the OSPF route flapping problem.</span></div>=0A<div><br>=0A</div>=0A<hr =
style=3D"width: 210px; height: 1px;" color=3D"#b5c4df" size=3D"1" align=3D=
"left">=0A<div><span>=0A<div style=3D"MARGIN: 10px; FONT-FAMILY: verdana; =
FONT-SIZE: 10pt">=0A<div><a href=3D"mailto:lizhenqiang@chinamobile.com">li=
zhenqiang@chinamobile.com</a></div>=0A</div>=0A</span></div>=0A<blockquote=
 style=3D"margin-top: 0px; margin-bottom: 0px; margin-left: 0.5em;">=0A<di=
v>&nbsp;</div>=0A<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;=
padding:3.0pt 0cm 0cm 0cm">=0A<div style=3D"PADDING-RIGHT: 8px; PADDING-LE=
FT: 8px; FONT-SIZE: 12px;FONT-FAMILY:tahoma;COLOR:#000000; BACKGROUND: #ef=
efef; PADDING-BOTTOM: 8px; PADDING-TOP: 8px">=0A<div><b>From:</b>&nbsp;<a =
href=3D"mailto:jie.dong@huawei.com" style=3D"color: blue; text-decoration:=
 underline;">Dongjie (Jimmy)</a></div>=0A<div><b>Date:</b>&nbsp;2016-08-18=
&nbsp;17:09</div>=0A<div><b>To:</b>&nbsp;<a href=3D"mailto:acee@cisco.com"=
 style=3D"color: blue; text-decoration: underline;">Acee Lindem (acee)</a>=
;=0A<a href=3D"mailto:ginsberg@cisco.com" style=3D"color: blue; text-decor=
ation: underline;">=0ALes Ginsberg (ginsberg)</a>; <a href=3D"mailto:ospf@=
ietf.org" style=3D"color: blue; text-decoration: underline;">=0Aospf@ietf.=
org</a></div>=0A<div><b>CC:</b>&nbsp;<a href=3D"mailto:zhangxudong@huawei.=
com" style=3D"color: blue; text-decoration: underline;">Zhangxudong (zhang=
xudong, VRP)</a>;=0A<a href=3D"mailto:lizhenqiang@chinamobile.com" style=
=3D"color: blue; text-decoration: underline;">=0Alizhenqiang@chinamobile.c=
om</a></div>=0A<div><b>Subject:</b>&nbsp;RE: [OSPF] Solicit feedbacks on d=
raft-dong-ospf-maxage-flush-problem-statement</div>=0A</div>=0A</div>=0A<d=
iv>=0A<div class=3D"FoxDiv20160825010243562836"><!--[if gte mso 9]><xml>=
=0A<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" ></o:shapedefaults>=0A=
</xml><![endif]--><!--[if gte mso 9]><xml>=0A<o:shapelayout v:ext=3D"edit"=
>=0A<o:idmap v:ext=3D"edit" data=3D"1" ></o:idmap>=0A</o:shapelayout></xml=
><![endif]-->=0A<div class=3D"WordSection1" style=3D"page: WordSection1;">=
=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; f=
ont-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-U=
S" style=3D"color:#1F497D">Hi Acee, <o:p></o:p></span></p>=0A<p class=3D"M=
soNormal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt=
; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"colo=
r:#1F497D"><o:p>&nbsp;</o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"=
margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: Cali=
bri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:#1F497D">Please s=
ee my replies inline:<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=
=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: =
Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>=0A<div>=0A<div style=3D"border:none;border-top:so=
lid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">=0A<p class=3D"MsoNormal" ali=
gn=3D"left" style=3D"text-align: justify; margin: 0px 0cm; font-size: 10.5=
pt; font-family: Calibri, sans-serif;">=0A<b><span lang=3D"EN-US" style=3D=
"font-size: 10pt; font-family: Tahoma, sans-serif;">From:</span></b><span =
lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Tahoma, sans-serif;"=
> Acee Lindem (acee) [<a href=3D"mailto:acee@cisco.com">mailto:acee@cisco.=
com</a>]=0A<br>=0A<b>Sent:</b> Thursday, August 18, 2016 2:23 AM<br>=0A<b>=
To:</b> Dongjie (Jimmy); Les Ginsberg (ginsberg); <a href=3D"mailto:ospf@i=
etf.org">=0Aospf@ietf.org</a><br>=0A<b>Cc:</b> Zhangxudong (zhangxudong, V=
RP); <a href=3D"mailto:lizhenqiang@chinamobile.com">=0Alizhenqiang@chinamo=
bile.com</a><br>=0A<b>Subject:</b> Re: [OSPF] Solicit feedbacks on draft-d=
ong-ospf-maxage-flush-problem-statement<o:p></o:p></span></p>=0A</div>=0A<=
/div>=0A<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify=
; margin: 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">=
=0A<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>=0A<div>=0A<p class=3D=
"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5=
pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"co=
lor:black">Speaking as a WG member who has some experience with OSPF imple=
mentations:&nbsp;<o:p></o:p></span></p>=0A</div>=0A<div>=0A<p class=3D"Mso=
Normal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; =
font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:=
black"><o:p>&nbsp;</o:p></span></p>=0A</div>=0A<div>=0A<p class=3D"MsoNorm=
al" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font=
-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:blac=
k">Hi Jie,&nbsp;<o:p></o:p></span></p>=0A</div>=0A<div>=0A<p class=3D"MsoN=
ormal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; f=
ont-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:b=
lack"><o:p>&nbsp;</o:p></span></p>=0A</div>=0A<div>=0A<p class=3D"MsoNorma=
l" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-=
family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:black=
">Along with Les, I=E2=80=99m also against progressing this draft.&nbsp;<o=
:p></o:p></span></p>=0A</div>=0A<div>=0A<p class=3D"MsoNormal" style=3D"ma=
rgin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: Calibr=
i, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:black"><o:p>&nbsp;<=
/o:p></span></p>=0A</div>=0A<div style=3D"border:none;border-top:solid #B5=
C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">=0A<p class=3D"MsoNormal" style=3D"m=
argin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: Calib=
ri, sans-serif;">=0A<b><span lang=3D"EN-US" style=3D"font-size:11.0pt;colo=
r:black">From: </span></b><span lang=3D"EN-US" style=3D"font-size:11.0pt;c=
olor:black">Jie Dong &lt;<a href=3D"mailto:jie.dong@huawei.com" style=3D"c=
olor: blue; text-decoration: underline;">jie.dong@huawei.com</a>&gt;<br>=
=0A<b>Date: </b>Tuesday, August 16, 2016 at 9:56 AM<br>=0A<b>To: </b>Acee =
Lindem &lt;<a href=3D"mailto:acee@cisco.com" style=3D"color: blue; text-de=
coration: underline;">acee@cisco.com</a>&gt;, "Les Ginsberg (ginsberg)" &l=
t;<a href=3D"mailto:ginsberg@cisco.com" style=3D"color: blue; text-decorat=
ion: underline;">ginsberg@cisco.com</a>&gt;,=0A OSPF WG List &lt;<a href=
=3D"mailto:ospf@ietf.org" style=3D"color: blue; text-decoration: underline=
;">ospf@ietf.org</a>&gt;<br>=0A<b>Cc: </b>"Zhangxudong (zhangxudong, VRP)"=
 &lt;<a href=3D"mailto:zhangxudong@huawei.com" style=3D"color: blue; text-=
decoration: underline;">zhangxudong@huawei.com</a>&gt;, "<a href=3D"mailto=
:lizhenqiang@chinamobile.com" style=3D"color: blue; text-decoration: under=
line;">lizhenqiang@chinamobile.com</a>"=0A &lt;<a href=3D"mailto:lizhenqia=
ng@chinamobile.com" style=3D"color: blue; text-decoration: underline;">liz=
henqiang@chinamobile.com</a>&gt;<br>=0A<b>Subject: </b>RE: [OSPF] Solicit =
feedbacks on draft-dong-ospf-maxage-flush-problem-statement<o:p></o:p></sp=
an></p>=0A</div>=0A<div>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm=
; text-align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif=
;">=0A<span lang=3D"EN-US" style=3D"color:black"><o:p>&nbsp;</o:p></span><=
/p>=0A</div>=0A<blockquote style=3D"border-style: none none none solid; bo=
rder-left-color: rgb(181, 196, 223); border-left-width: 4.5pt; padding: 0c=
m 0cm 0cm 4pt; margin: 0px 0cm 0px 0.5em;" id=3D"MAC_OUTLOOK_ATTRIBUTION_B=
LOCKQUOTE">=0A<div>=0A<div>=0A<p class=3D"MsoNormal" style=3D"margin: 0px =
0cm; text-align: justify; font-size: 10.5pt; font-family: Calibri, sans-se=
rif;">=0A<span lang=3D"EN-US" style=3D"color:#1F497D">Hi Acee, </span><spa=
n lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=
=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 1=
0.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D=
"color:#1F497D">&nbsp;</span><span lang=3D"EN-US" style=3D"color:black"><o=
:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; te=
xt-align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=
=0A<span lang=3D"EN-US" style=3D"color:#1F497D">Thanks a lot for your feed=
backs.</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span>=
</p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justif=
y; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"=
EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-US" style=3D"=
color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"marg=
in: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: Calibri,=
 sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:#1F497D">For packet c=
orruption which impacts the LS age before the LSAs are packed into LSU pac=
ket, I agree it is less likely to happen than the other cases. However I t=
hink we agree that OSPF authentication only protect the=0A packet level co=
rruption, which cannot help to detect the corruption at LSA level.</span><=
span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A</div>=
=0A</div>=0A</blockquote>=0A<div>=0A<p class=3D"MsoNormal" align=3D"left" =
style=3D"text-align: justify; margin: 0px 0cm; font-size: 10.5pt; font-fam=
ily: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:black"><=
o:p>&nbsp;</o:p></span></p>=0A</div>=0A<div>=0A<p class=3D"MsoNormal" alig=
n=3D"left" style=3D"text-align: justify; margin: 0px 0cm; font-size: 10.5p=
t; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"col=
or:black">So, you are suggesting that LSAs are corrupted in the database i=
n such a way that the LSA Age is set exactly to 0xE10? How would the imple=
mentation know that this had happened and prematurely age the packet? Data=
base aging=0A just doesn=E2=80=99t work this way (unless the implementatio=
n is particularly na=C3=AFve).&nbsp;<o:p></o:p></span></p>=0A<p class=3D"M=
soNormal" align=3D"left" style=3D"text-align: justify; margin: 0px 0cm; fo=
nt-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US=
" style=3D"color:#1F497D"><o:p>&nbsp;</o:p></span></p>=0A<p class=3D"MsoNo=
rmal" align=3D"left" style=3D"text-align: justify; margin: 0px 0cm; font-s=
ize: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" st=
yle=3D"color:#1F497D">[Jie] Actually the case is when the LSA is about to =
be exchanged with neighbor, during the message packing the LS age is corru=
pted to either Maxage or a large number close to Maxage. The sending route=
r does not intend=0A to do a Maxage flush, however the neighbor routers wh=
ich receive the message would treat this as a flush. This is a possible ca=
se although less likely to happen than the other cases.<o:p></o:p></span><=
/p>=0A</div>=0A<div>=0A<p class=3D"MsoNormal" align=3D"left" style=3D"text=
-align: justify; margin: 0px 0cm; font-size: 10.5pt; font-family: Calibri,=
 sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:black"><o:p>&nbsp;</o=
:p></span></p>=0A</div>=0A<blockquote style=3D"border-style: none none non=
e solid; border-left-color: rgb(181, 196, 223); border-left-width: 4.5pt; =
padding: 0cm 0cm 0cm 4pt; margin: 0px 0cm 0px 0.5em;" id=3D"MAC_OUTLOOK_AT=
TRIBUTION_BLOCKQUOTE">=0A<div>=0A<div>=0A<p class=3D"MsoNormal" style=3D"m=
argin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: Calib=
ri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</s=
pan><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p=
 class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-s=
ize: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" st=
yle=3D"color:#1F497D">In my understanding, robustness is an important feat=
ure of network protocols, which include the robustness to errors and failu=
res happened in the network. If there is a bug in a particular router in t=
he network, operator=0A would not allow the whole network being impacted, =
which means other routers in the network needs to work properly in this si=
tuation. For example in BGP, the error handling mechanism has been optimiz=
ed to avoid unnecessary session teardown.</span><span lang=3D"EN-US" style=
=3D"color:black"><o:p></o:p></span></p>=0A</div>=0A</div>=0A</blockquote>=
=0A<div>=0A<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: just=
ify; margin: 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;=
">=0A<span lang=3D"EN-US" style=3D"color:black"><o:p>&nbsp;</o:p></span></=
p>=0A</div>=0A<div>=0A<p class=3D"MsoNormal" align=3D"left" style=3D"text-=
align: justify; margin: 0px 0cm; font-size: 10.5pt; font-family: Calibri, =
sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:black">So you agree yo=
ur problem statement is confined to a software bug resulting in LSAs being=
 aged too quickly? I think this is the third time I=E2=80=99ve raised this=
 question.&nbsp;<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" align=3D"l=
eft" style=3D"text-align: justify; margin: 0px 0cm; font-size: 10.5pt; fon=
t-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:#1F=
497D">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=0A<o:p></o:p></span></p>=0A<p class=3D"MsoN=
ormal" align=3D"left" style=3D"text-align: justify; margin: 0px 0cm; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" s=
tyle=3D"color:#1F497D">[Jie] As I said before, the problems happened in th=
e production network are caused by software bug in LSA aging, so I think t=
his is the major case.=0A<o:p></o:p></span></p>=0A</div>=0A<div>=0A<p clas=
s=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin: 0px 0=
cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D=
"EN-US" style=3D"color:black"><o:p>&nbsp;</o:p></span></p>=0A</div>=0A<div=
>=0A<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; ma=
rgin: 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<s=
pan lang=3D"EN-US" style=3D"color:black">If it has such a problem (whether=
 it be due to a system timer bug or a some more specific aging problem), i=
t seems the router would also be refreshing its LSAs all too frequently (a=
t least at twice the rate) and it would=0A be readily identifiable. For a =
system time problem, the router would likely have many other problems. For=
 example, it would not maintain OSPF adjacencies if the dead timer advance=
s fast enough. It would retransmit at a very fast rate as well. Are you go=
ing=0A to write problem statements and suggest solutions for these situati=
ons as well?&nbsp;<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" align=3D=
"left" style=3D"text-align: justify; margin: 0px 0cm; font-size: 10.5pt; f=
ont-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:#=
1F497D"><o:p>&nbsp;</o:p></span></p>=0A</div>=0A<div>=0A<p class=3D"MsoNor=
mal" align=3D"left" style=3D"text-align: justify; margin: 0px 0cm; font-si=
ze: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" sty=
le=3D"color:#1F497D">[Jie] This depends on the implementation. the softwar=
e bug may only impact the aging of LSAs received from other routers. And f=
requent LSA refreshing may be caused by other cases such as link oscillati=
on. &nbsp;For a system=0A timer problem, OSPF adjacency may oscillate, but=
 if the management connection is impacted, such oscillation is difficult t=
o be identified.=0A<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" align=
=3D"left" style=3D"text-align: justify; margin: 0px 0cm; font-size: 10.5pt=
; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"colo=
r:#1F497D"><o:p>&nbsp;</o:p></span></p>=0A</div>=0A<div>=0A<p class=3D"Mso=
Normal" align=3D"left" style=3D"text-align: justify; margin: 0px 0cm; font=
-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" =
style=3D"color:black">What about other bugs? What if the router erroneousl=
y specifies a neighbor=E2=80=99s router-id as its own in a Router-LSA? Is =
this a problem the protocol should handle?&nbsp;<o:p></o:p></span></p>=0A<=
p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span l=
ang=3D"EN-US" style=3D"color:#1F497D"><o:p>&nbsp;</o:p></span></p>=0A<p cl=
ass=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin: 0px=
 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=
=3D"EN-US" style=3D"color:#1F497D">[Jie] Depends on the significance to ne=
twork, case by case analysis may be needed.=0A<o:p></o:p></span></p>=0A</d=
iv>=0A<div>=0A<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: j=
ustify; margin: 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-ser=
if;">=0A<span lang=3D"EN-US" style=3D"color:black"><o:p>&nbsp;</o:p></span=
></p>=0A</div>=0A<blockquote style=3D"border-style: none none none solid; =
border-left-color: rgb(181, 196, 223); border-left-width: 4.5pt; padding: =
0cm 0cm 0cm 4pt; margin: 0px 0cm 0px 0.5em;" id=3D"MAC_OUTLOOK_ATTRIBUTION=
_BLOCKQUOTE">=0A<div>=0A<div>=0A<p class=3D"MsoNormal" style=3D"margin: 0p=
x 0cm; text-align: justify; font-size: 10.5pt; font-family: Calibri, sans-=
serif;">=0A<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span=
 lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D=
"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5=
pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"co=
lor:#1F497D">I agree that OSPF Yang notification for LSA timeout is a nice=
 thing to have and could be useful to identify the misbehaved router. My c=
oncern is sometimes the network may be severely impacted that the connecti=
vity of=0A netconf/restconf is also impacted. To avoid this, some mechanis=
m to mitigate the impact of this problem could help.</span><span lang=3D"E=
N-US" style=3D"color:black"><o:p></o:p></span></p>=0A</div>=0A</div>=0A</b=
lockquote>=0A<div>=0A<p class=3D"MsoNormal" align=3D"left" style=3D"text-a=
lign: justify; margin: 0px 0cm; font-size: 10.5pt; font-family: Calibri, s=
ans-serif;">=0A<span lang=3D"EN-US" style=3D"color:black"><o:p>&nbsp;</o:p=
></span></p>=0A</div>=0A<div>=0A<p class=3D"MsoNormal" align=3D"left" styl=
e=3D"text-align: justify; margin: 0px 0cm; font-size: 10.5pt; font-family:=
 Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:black">I bel=
ieve a router have such impact would be easy to identify=E2=80=A6&nbsp;<o:=
p></o:p></span></p>=0A<p class=3D"MsoNormal" align=3D"left" style=3D"text-=
align: justify; margin: 0px 0cm; font-size: 10.5pt; font-family: Calibri, =
sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&nbsp;</=
o:p></span></p>=0A<p class=3D"MsoNormal" align=3D"left" style=3D"text-alig=
n: justify; margin: 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans=
-serif;">=0A<span lang=3D"EN-US" style=3D"color:#1F497D">[Jie] According t=
o the feedback from on-site engineers, when IGP routing is oscillating sev=
erely which makes the management connection unavailable, it usually takes =
much longer time for troubleshooting, as logging to=0A any router cannot b=
e done via the management network. So maybe it would be better to have som=
e automatic mechanism to reduce the impact before it becomes a big problem=
 to troubleshoot.<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" align=3D"=
left" style=3D"text-align: justify; margin: 0px 0cm; font-size: 10.5pt; fo=
nt-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:#1=
F497D"><o:p>&nbsp;</o:p></span></p>=0A<p class=3D"MsoNormal" align=3D"left=
" style=3D"text-align: justify; margin: 0px 0cm; font-size: 10.5pt; font-f=
amily: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:#1F497=
D">Best regards,<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" align=3D"l=
eft" style=3D"text-align: justify; margin: 0px 0cm; font-size: 10.5pt; fon=
t-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:#1F=
497D">Jie<o:p></o:p></span></p>=0A</div>=0A<div>=0A<p class=3D"MsoNormal" =
align=3D"left" style=3D"text-align: justify; margin: 0px 0cm; font-size: 1=
0.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D=
"color:black"><o:p>&nbsp;</o:p></span></p>=0A</div>=0A<div>=0A<p class=3D"=
MsoNormal" align=3D"left" style=3D"text-align: justify; margin: 0px 0cm; f=
ont-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-U=
S" style=3D"color:black">Thanks,<o:p></o:p></span></p>=0A</div>=0A<div>=0A=
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin=
: 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span =
lang=3D"EN-US" style=3D"color:black">Acee&nbsp;<o:p></o:p></span></p>=0A</=
div>=0A<div>=0A<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: =
justify; margin: 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-se=
rif;">=0A<span lang=3D"EN-US" style=3D"color:black"><o:p>&nbsp;</o:p></spa=
n></p>=0A</div>=0A<blockquote style=3D"border-style: none none none solid;=
 border-left-color: rgb(181, 196, 223); border-left-width: 4.5pt; padding:=
 0cm 0cm 0cm 4pt; margin: 0px 0cm 0px 0.5em;" id=3D"MAC_OUTLOOK_ATTRIBUTIO=
N_BLOCKQUOTE">=0A<div>=0A<div>=0A<p class=3D"MsoNormal" style=3D"margin: 0=
px 0cm; text-align: justify; font-size: 10.5pt; font-family: Calibri, sans=
-serif;">=0A<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><spa=
n lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=
=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 1=
0.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D=
"color:#1F497D">Best regards,</span><span lang=3D"EN-US" style=3D"color:bl=
ack"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px =
0cm; text-align: justify; font-size: 10.5pt; font-family: Calibri, sans-se=
rif;">=0A<span lang=3D"EN-US" style=3D"color:#1F497D">Jie</span><span lang=
=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoN=
ormal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; f=
ont-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:#=
1F497D">&nbsp;</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p=
></span></p>=0A<div>=0A<div style=3D"border:none;border-top:solid #B5C4DF =
1.0pt;padding:3.0pt 0cm 0cm 0cm">=0A<p class=3D"MsoNormal" align=3D"left" =
style=3D"text-align: justify; margin: 0px 0cm; font-size: 10.5pt; font-fam=
ily: Calibri, sans-serif;">=0A<b><span lang=3D"EN-US" style=3D"font-size: =
10pt; font-family: Tahoma, sans-serif; color: black;">From:</span></b><spa=
n lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Tahoma, sans-serif=
; color: black;"> Acee Lindem (acee) [<a href=3D"mailto:acee@cisco.com" st=
yle=3D"color: blue; text-decoration: underline;">mailto:acee@cisco.com</a>=
]=0A<br>=0A<b>Sent:</b> Saturday, August 13, 2016 3:27 AM<br>=0A<b>To:</b>=
 Les Ginsberg (ginsberg); Dongjie (Jimmy); <a href=3D"mailto:ospf@ietf.org=
" style=3D"color: blue; text-decoration: underline;">=0Aospf@ietf.org</a><=
br>=0A<b>Cc:</b> Zhangxudong (zhangxudong, VRP); <a href=3D"mailto:lizhenq=
iang@chinamobile.com" style=3D"color: blue; text-decoration: underline;">=
=0Alizhenqiang@chinamobile.com</a><br>=0A<b>Subject:</b> Re: [OSPF] Solici=
t feedbacks on draft-dong-ospf-maxage-flush-problem-statement</span><span =
lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A</div>=0A</d=
iv>=0A<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; =
margin: 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A=
<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>=0A=
<div>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justi=
fy; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D=
"EN-US" style=3D"color:black">Speaking as a WG member:&nbsp;<o:p></o:p></s=
pan></p>=0A</div>=0A<div>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0c=
m; text-align: justify; font-size: 10.5pt; font-family: Calibri, sans-seri=
f;">=0A<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span>=
</p>=0A</div>=0A<div>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; t=
ext-align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=
=0A<span lang=3D"EN-US" style=3D"color:black">Hi Jie,&nbsp;<o:p></o:p></sp=
an></p>=0A</div>=0A<div>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm=
; text-align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif=
;">=0A<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span><=
/p>=0A</div>=0A<div>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; te=
xt-align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=
=0A<span lang=3D"EN-US" style=3D"color:black">I believe we agree that the =
problem is confined to OSPF bugs, system timer bugs, &nbsp;and packet corr=
uption. I=E2=80=99d assert that corruption can be detected via OSPF authen=
tication. In fact, there is a well-known antidote where=0A IS-IS authentic=
ation was enabled solely for the purpose of filtering corrupted protocol p=
ackets in an environment with line cards that were prone to such corruptio=
n. Hence, we are left with problems based on OSPF or system timer bugs. If=
 there were a system=0A timer bug, I=E2=80=99d doubt that networking devic=
e with such a bug would be functional to the point of being able to establ=
ish and maintaining OSPF adjacencies.&nbsp;&nbsp;Do we really want to enha=
nce the protocol to deal with bugs?&nbsp;<o:p></o:p></span></p>=0A</div>=
=0A<div>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: ju=
stify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=
=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>=0A</div>=0A<=
div>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justif=
y; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"=
EN-US" style=3D"color:black">I=E2=80=99ve thought about this and one poten=
tial action I could envision would be to add a separate OSPF YANG notifica=
tion where an LSA times out and a router other than the originator purges =
it. This way, the misbehaving OSPF=0A router could be readily identified.&=
nbsp;<o:p></o:p></span></p>=0A</div>=0A<div>=0A<p class=3D"MsoNormal" styl=
e=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family:=
 Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:black">&nbsp=
;<o:p></o:p></span></p>=0A</div>=0A<div>=0A<p class=3D"MsoNormal" style=3D=
"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: Cal=
ibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:black">Thanks,<o=
:p></o:p></span></p>=0A</div>=0A<div>=0A<p class=3D"MsoNormal" style=3D"ma=
rgin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: Calibr=
i, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:black">Acee&nbsp;<o=
:p></o:p></span></p>=0A</div>=0A<div>=0A<p class=3D"MsoNormal" style=3D"ma=
rgin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: Calibr=
i, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p><=
/o:p></span></p>=0A</div>=0A<div>=0A<p class=3D"MsoNormal" style=3D"margin=
: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: Calibri, s=
ans-serif;">=0A<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p=
></span></p>=0A</div>=0A<div style=3D"border:none;border-top:solid #B5C4DF=
 1.0pt;padding:3.0pt 0cm 0cm 0cm">=0A<p class=3D"MsoNormal" style=3D"margi=
n: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;">=0A<b><span lang=3D"EN-US" style=3D"font-size:11.0pt;color:bl=
ack">From: </span></b><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:black">OSPF &lt;<a href=3D"mailto:ospf-bounces@ietf.org" style=3D"color: =
blue; text-decoration: underline;">ospf-bounces@ietf.org</a>&gt; on behalf=
=0A of "Les Ginsberg (ginsberg)" &lt;<a href=3D"mailto:ginsberg@cisco.com"=
 style=3D"color: blue; text-decoration: underline;">ginsberg@cisco.com</a>=
&gt;<br>=0A<b>Date: </b>Thursday, August 11, 2016 at 1:29 PM<br>=0A<b>To: =
</b>Jie Dong &lt;<a href=3D"mailto:jie.dong@huawei.com" style=3D"color: bl=
ue; text-decoration: underline;">jie.dong@huawei.com</a>&gt;, OSPF WG List=
 &lt;<a href=3D"mailto:ospf@ietf.org" style=3D"color: blue; text-decoratio=
n: underline;">ospf@ietf.org</a>&gt;<br>=0A<b>Cc: </b>"Zhangxudong (zhangx=
udong, VRP)" &lt;<a href=3D"mailto:zhangxudong@huawei.com" style=3D"color:=
 blue; text-decoration: underline;">zhangxudong@huawei.com</a>&gt;, "<a hr=
ef=3D"mailto:lizhenqiang@chinamobile.com" style=3D"color: blue; text-decor=
ation: underline;">lizhenqiang@chinamobile.com</a>"=0A &lt;<a href=3D"mail=
to:lizhenqiang@chinamobile.com" style=3D"color: blue; text-decoration: und=
erline;">lizhenqiang@chinamobile.com</a>&gt;<br>=0A<b>Subject: </b>Re: [OS=
PF] Solicit feedbacks on draft-dong-ospf-maxage-flush-problem-statement</s=
pan><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A</=
div>=0A<div>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align=
: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span =
lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>=0A</div>=
=0A<blockquote style=3D"border-style: none none none solid; border-left-co=
lor: rgb(181, 196, 223); border-left-width: 4.5pt; padding: 0cm 0cm 0cm 4p=
t; margin: 0px 0cm 0px 0.5em;" id=3D"MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE">=
=0A<div>=0A<div>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-a=
lign: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<s=
pan lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">Jie =E2=80=93<=
/span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font=
-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" =
style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span><span lang=3D"EN-US"=
 style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" sty=
le=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family=
: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;=
color:#1F497D">Having the discussion has certainly been a good thing, but =
if the consensus of the WG is that there is no protocol change required th=
en there is no need for any draft =E2=80=93 which is my current position.<=
/span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font=
-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" =
style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span><span lang=3D"EN-US"=
 style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" sty=
le=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family=
: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;=
color:#1F497D">The other point is that you seem to be confusing the IS-IS =
Purge origination TLV (RFC 6232) with detecting invalid purges/remaining l=
ifetime corruption. This is not the case. RFC 6232 simply allows us=0A to =
detect which router originated a purge =E2=80=93 it is not able to detect =
whether a purge is valid/invalid =E2=80=93 and was not motivated by concer=
ns about remaining lifetime corruption.</span><span lang=3D"EN-US" style=
=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"=
margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: Cali=
bri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:=
#1F497D">&nbsp;</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:=
p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-alig=
n: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span=
 lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;&nbsp; Les<=
/span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font=
-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" =
style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span><span lang=3D"EN-US"=
 style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" sty=
le=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family=
: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;=
color:#1F497D">&nbsp;</span><span lang=3D"EN-US" style=3D"color:black"><o:=
p></o:p></span></p>=0A<div style=3D"border:none;border-left:solid blue 1.5=
pt;padding:0cm 0cm 0cm 4.0pt">=0A<div>=0A<div style=3D"border:none;border-=
top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">=0A<p class=3D"MsoNorma=
l" align=3D"left" style=3D"text-align: justify; margin: 0px 0cm; font-size=
: 10.5pt; font-family: Calibri, sans-serif;">=0A<b><span lang=3D"EN-US" st=
yle=3D"font-size: 10pt; font-family: Tahoma, sans-serif; color: black;">Fr=
om:</span></b><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Tahoma, sans-serif; color: black;"> Dongjie (Jimmy) [<a href=3D"mailto:jie=
.dong@huawei.com" style=3D"color: blue; text-decoration: underline;">mailt=
o:jie.dong@huawei.com</a>]=0A<br>=0A<b>Sent:</b> Wednesday, August 10, 201=
6 9:24 PM<br>=0A<b>To:</b> Les Ginsberg (ginsberg); <a href=3D"mailto:ospf=
@ietf.org" style=3D"color: blue; text-decoration: underline;">=0Aospf@ietf=
.org</a><br>=0A<b>Cc:</b> Zhangxudong (zhangxudong, VRP); <a href=3D"mailt=
o:lizhenqiang@chinamobile.com" style=3D"color: blue; text-decoration: unde=
rline;">=0Alizhenqiang@chinamobile.com</a><br>=0A<b>Subject:</b> RE: [OSPF=
] Solicit feedbacks on draft-dong-ospf-maxage-flush-problem-statement</spa=
n><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A</di=
v>=0A</div>=0A<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: j=
ustify; margin: 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-ser=
if;">=0A<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span=
></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justi=
fy; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D=
"EN-US" style=3D"font-size:11.0pt;color:#1F497D">Hi Les,</span><span lang=
=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoN=
ormal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; f=
ont-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-si=
ze:11.0pt;color:#1F497D">&nbsp;</span><span lang=3D"EN-US" style=3D"color:=
black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0p=
x 0cm; text-align: justify; font-size: 10.5pt; font-family: Calibri, sans-=
serif;">=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">T=
he current draft is about problem statement, so IMO what the WG needs to c=
onsider is whether this is a vulnerability of OSPF protocol, and whether i=
t can have negative impact to the network. If the=0A problem is acknowledg=
ed, IMO it is worth to be documented.</span><span lang=3D"EN-US" style=3D"=
color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"marg=
in: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: Calibri,=
 sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F4=
97D">&nbsp;</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></=
span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: j=
ustify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lan=
g=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">The =E2=80=9CROI=E2=
=80=9D as you mentioned is for the evaluation of the proposed solutions. I=
 totally agree that for the timer bug case, recognizing and ignoring the r=
eceived abnormal Maxage LSAs cannot stop the misbehaved=0A router from gen=
erating further Maxage LSA, as it is a systematic problem, which can only =
be fixed after the operator identifies that router. This is also similar t=
o the systematic corruption of IS-IS remain time. &nbsp;And this is why th=
is draft mentions two kinds=0A of potential solutions, the mitigation mech=
anism can avoid the network being severely impacted by the problem, while =
for systematic problems, problem localization is needed to identify the mi=
sbehaved router and then solve the problem.</span><span lang=3D"EN-US" sty=
le=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=
=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: =
Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;co=
lor:#1F497D">&nbsp;</span><span lang=3D"EN-US" style=3D"color:black"><o:p>=
</o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-=
align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<=
span lang=3D"EN-US" style=3D"color:#1F497D">Best regards,</span><span lang=
=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoN=
ormal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; f=
ont-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:#=
1F497D">Jie</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></=
span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: j=
ustify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lan=
g=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-US" styl=
e=3D"color:black"><o:p></o:p></span></p>=0A<div style=3D"border:none;borde=
r-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt">=0A<div>=0A<div style=
=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">=
=0A<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; mar=
gin: 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<b>=
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:black">From:</span></=
b><span lang=3D"EN-US" style=3D"font-size:11.0pt;color:black"> OSPF [<a hr=
ef=3D"mailto:ospf-bounces@ietf.org" style=3D"color: blue; text-decoration:=
 underline;">mailto:ospf-bounces@ietf.org</a>]=0A<b>On Behalf Of </b>Les G=
insberg (ginsberg)<br>=0A<b>Sent:</b> Monday, August 08, 2016 2:14 AM<br>=
=0A<b>To:</b> Dongjie (Jimmy) &lt;<a href=3D"mailto:jie.dong@huawei.com" s=
tyle=3D"color: blue; text-decoration: underline;">jie.dong@huawei.com</a>&=
gt;;=0A<a href=3D"mailto:ospf@ietf.org" style=3D"color: blue; text-decorat=
ion: underline;">ospf@ietf.org</a><br>=0A<b>Cc:</b> Zhangxudong (zhangxudo=
ng, VRP) &lt;<a href=3D"mailto:zhangxudong@huawei.com" style=3D"color: blu=
e; text-decoration: underline;">zhangxudong@huawei.com</a>&gt;;=0A<a href=
=3D"mailto:lizhenqiang@chinamobile.com" style=3D"color: blue; text-decorat=
ion: underline;">=0Alizhenqiang@chinamobile.com</a><br>=0A<b>Subject:</b> =
Re: [OSPF] Solicit feedbacks on draft-dong-ospf-maxage-flush-problem-state=
ment</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></=
p>=0A</div>=0A</div>=0A<p class=3D"MsoNormal" align=3D"left" style=3D"text=
-align: justify; margin: 0px 0cm; font-size: 10.5pt; font-family: Calibri,=
 sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o=
:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-ali=
gn: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<spa=
n lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">Jie =E2=80=93</s=
pan><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p=
 class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-s=
ize: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" st=
yle=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span><span lang=3D"EN-US" s=
tyle=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=
=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: =
Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;co=
lor:#1F497D">Thinking about the following some more:</span><span lang=3D"E=
N-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal=
" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-f=
amily: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-size:11=
.0pt;color:#1F497D">&nbsp;</span><span lang=3D"EN-US" style=3D"color:black=
"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm=
; text-align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif=
;">=0A<i><span lang=3D"EN-US" style=3D"font-size:11.0pt;color:red">&lt;sni=
p&gt;</span></i><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></sp=
an></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: jus=
tify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<i><span la=
ng=3D"EN-US" style=3D"font-size:11.0pt;color:red">What remains is the poss=
ibility that an implementation has some bug and unintentionally modifies t=
he age to something other than what it should be due to the actual elapsed=
 time since LSA generation.=0A I suppose a mechanism equivalent to what th=
e IS-IS draft defined i.e. setting the age to =E2=80=9Cnew=E2=80=9D (0 in =
OSPF case) when first receiving a non-self-generated LSA could be useful t=
o prevent negative impacts of such an implementation bug. Is this what you=
 intend?</span></i><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p><=
/span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: =
justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<i><span=
 lang=3D"EN-US" style=3D"font-size:11.0pt;color:red">&nbsp;</span></i><spa=
n lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=
=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 1=
0.5pt; font-family: Calibri, sans-serif;">=0A<i><span lang=3D"EN-US" style=
=3D"font-size:11.0pt;color:red">[Jie]: More specifically, the problem coul=
d be caused by either =E2=80=9Csetting the LS age field incorrectly due to=
 implementation bug=E2=80=9D or =E2=80=9Csystem timer runs so fast that th=
e LS age reaches MaxAge much earlier=0A than other routers=E2=80=9D. Anoth=
er less likely case is that the LS age field is corrupted before the LSA i=
s assembled into OSPF packet.</span></i><span lang=3D"EN-US" style=3D"colo=
r:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: =
0px 0cm; text-align: justify; font-size: 10.5pt; font-family: Calibri, san=
s-serif;">=0A<i><span lang=3D"EN-US" style=3D"font-size:11.0pt;color:red">=
&lt;end snip&gt;</span></i><span lang=3D"EN-US" style=3D"color:black"><o:p=
></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text=
-align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A=
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span=
><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p cl=
ass=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-size=
: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=
=3D"font-size:11.0pt;color:#1F497D">The benefits are extremely limited. If=
 a router prematurely ages an LSA due to a timer bug, ignoring the receive=
d LSA age on reception isn=E2=80=99t going to prevent premature purging by=
 the router which has=0A the bug. So the effect of ignoring the received L=
SA age prior to reaching MAXAGE will be short lived. You are then left wit=
h the possibility that an implementation corrupts the LSA age BEFORE calcu=
lating checksum/crypto authentication =E2=80=93 but its local timeout=0A l=
ogic is unaffected. This has very limited value. Whether the WG considers =
this worth pursuing is something you need to ask. For myself, I don=E2=80=
=99t see much ROI here.</span><span lang=3D"EN-US" style=3D"color:black"><=
o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; t=
ext-align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=
=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</s=
pan><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p=
 class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-s=
ize: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" st=
yle=3D"font-size:11.0pt;color:#1F497D">&nbsp;&nbsp;Les</span><span lang=3D=
"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNorm=
al" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font=
-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-size:=
11.0pt;color:#1F497D">&nbsp;</span><span lang=3D"EN-US" style=3D"color:bla=
ck"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0=
cm; text-align: justify; font-size: 10.5pt; font-family: Calibri, sans-ser=
if;">=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbs=
p;</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=
=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; f=
ont-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-U=
S" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>=0A<div style=3D"border:no=
ne;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt">=0A<div>=0A<div=
 style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm=
 0cm">=0A<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justif=
y; margin: 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">=
=0A<b><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Tahoma, =
sans-serif; color: black;">From:</span></b><span lang=3D"EN-US" style=3D"f=
ont-size: 10pt; font-family: Tahoma, sans-serif; color: black;"> Dongjie (=
Jimmy) [<a href=3D"mailto:jie.dong@huawei.com" style=3D"color: blue; text-=
decoration: underline;">mailto:jie.dong@huawei.com</a>]=0A<br>=0A<b>Sent:<=
/b> Monday, August 01, 2016 9:43 PM<br>=0A<b>To:</b> Les Ginsberg (ginsber=
g); <a href=3D"mailto:ospf@ietf.org" style=3D"color: blue; text-decoration=
: underline;">=0Aospf@ietf.org</a><br>=0A<b>Cc:</b> Zhangxudong (zhangxudo=
ng, VRP); <a href=3D"mailto:lizhenqiang@chinamobile.com" style=3D"color: b=
lue; text-decoration: underline;">=0Alizhenqiang@chinamobile.com</a><br>=
=0A<b>Subject:</b> RE: [OSPF] Solicit feedbacks on draft-dong-ospf-maxage-=
flush-problem-statement</span><span lang=3D"EN-US" style=3D"color:black"><=
o:p></o:p></span></p>=0A</div>=0A</div>=0A<p class=3D"MsoNormal" align=3D"=
left" style=3D"text-align: justify; margin: 0px 0cm; font-size: 10.5pt; fo=
nt-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:bl=
ack">&nbsp;<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin=
: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: Calibri, s=
ans-serif;">=0A<span lang=3D"EN-US" style=3D"color:#1F497D">Hi Les, </span=
><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p cl=
ass=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-size=
: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=
=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-US" style=3D"color:black"=
><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm;=
 text-align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;=
">=0A<span lang=3D"EN-US" style=3D"color:#1F497D">Please see my replies wi=
th [Jie2]:</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></s=
pan></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: ju=
stify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=
=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-US" style=
=3D"color:black"><o:p></o:p></span></p>=0A<div>=0A<div style=3D"border:non=
e;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">=0A<p class=3D=
"MsoNormal" align=3D"left" style=3D"text-align: justify; margin: 0px 0cm; =
font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<b><span lang=3D"=
EN-US" style=3D"font-size: 10pt; font-family: Tahoma, sans-serif; color: b=
lack;">From:</span></b><span lang=3D"EN-US" style=3D"font-size: 10pt; font=
-family: Tahoma, sans-serif; color: black;"> Les Ginsberg (ginsberg) [<a h=
ref=3D"mailto:ginsberg@cisco.com" style=3D"color: blue; text-decoration: u=
nderline;">mailto:ginsberg@cisco.com</a>]=0A<br>=0A<b>Sent:</b> Monday, Au=
gust 01, 2016 9:57 PM<br>=0A<b>To:</b> Dongjie (Jimmy); <a href=3D"mailto:=
ospf@ietf.org" style=3D"color: blue; text-decoration: underline;">=0Aospf@=
ietf.org</a><br>=0A<b>Cc:</b> Zhangxudong (zhangxudong, VRP); <a href=3D"m=
ailto:lizhenqiang@chinamobile.com" style=3D"color: blue; text-decoration: =
underline;">=0Alizhenqiang@chinamobile.com</a><br>=0A<b>Subject:</b> RE: [=
OSPF] Solicit feedbacks on draft-dong-ospf-maxage-flush-problem-statement<=
/span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A=
</div>=0A</div>=0A<p class=3D"MsoNormal" align=3D"left" style=3D"text-alig=
n: justify; margin: 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans=
-serif;">=0A<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></=
span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: j=
ustify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lan=
g=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">Jie -</span><span lan=
g=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"Mso=
Normal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; =
font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-s=
ize:11.0pt;color:#1F497D">&nbsp;</span><span lang=3D"EN-US" style=3D"color=
:black"><o:p></o:p></span></p>=0A<div style=3D"border:none;border-left:sol=
id blue 1.5pt;padding:0cm 0cm 0cm 4.0pt">=0A<div>=0A<div style=3D"border:n=
one;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">=0A<p class=
=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin: 0px 0c=
m; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<b><span lang=
=3D"EN-US" style=3D"font-size: 10pt; font-family: Tahoma, sans-serif; colo=
r: black;">From:</span></b><span lang=3D"EN-US" style=3D"font-size: 10pt; =
font-family: Tahoma, sans-serif; color: black;"> Dongjie (Jimmy) [<a href=
=3D"mailto:jie.dong@huawei.com" style=3D"color: blue; text-decoration: und=
erline;">mailto:jie.dong@huawei.com</a>]=0A<br>=0A<b>Sent:</b> Monday, Aug=
ust 01, 2016 1:44 AM<br>=0A<b>To:</b> Les Ginsberg (ginsberg); <a href=3D"=
mailto:ospf@ietf.org" style=3D"color: blue; text-decoration: underline;">=
=0Aospf@ietf.org</a><br>=0A<b>Cc:</b> Zhangxudong (zhangxudong, VRP); <a h=
ref=3D"mailto:lizhenqiang@chinamobile.com" style=3D"color: blue; text-deco=
ration: underline;">=0Alizhenqiang@chinamobile.com</a><br>=0A<b>Subject:</=
b> RE: [OSPF] Solicit feedbacks on draft-dong-ospf-maxage-flush-problem-st=
atement</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span=
></p>=0A</div>=0A</div>=0A<p class=3D"MsoNormal" align=3D"left" style=3D"t=
ext-align: justify; margin: 0px 0cm; font-size: 10.5pt; font-family: Calib=
ri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p>=
</o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-=
align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<=
span lang=3D"EN-US" style=3D"color:#1F497D">Hi Les,</span><span lang=3D"EN=
-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal"=
 style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-fa=
mily: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:#1F497D=
">&nbsp;</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></spa=
n></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: just=
ify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=
=3D"EN-US" style=3D"color:#1F497D">Please see inline with [Jie]:</span><sp=
an lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=
=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 1=
0.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D=
"color:#1F497D">&nbsp;</span><span lang=3D"EN-US" style=3D"color:black"><o=
:p></o:p></span></p>=0A<div>=0A<div style=3D"border:none;border-top:solid =
#B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">=0A<p class=3D"MsoNormal" align=
=3D"left" style=3D"text-align: justify; margin: 0px 0cm; font-size: 10.5pt=
; font-family: Calibri, sans-serif;">=0A<b><span lang=3D"EN-US" style=3D"f=
ont-size: 10pt; font-family: Tahoma, sans-serif; color: black;">From:</spa=
n></b><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Tahoma, =
sans-serif; color: black;"> Les Ginsberg (ginsberg) [<a href=3D"mailto:gin=
sberg@cisco.com" style=3D"color: blue; text-decoration: underline;">mailto=
:ginsberg@cisco.com</a>]=0A<br>=0A<b>Sent:</b> Monday, August 01, 2016 3:0=
9 PM<br>=0A<b>To:</b> Dongjie (Jimmy); <a href=3D"mailto:ospf@ietf.org" st=
yle=3D"color: blue; text-decoration: underline;">=0Aospf@ietf.org</a><br>=
=0A<b>Cc:</b> Zhangxudong (zhangxudong, VRP); <a href=3D"mailto:lizhenqian=
g@chinamobile.com" style=3D"color: blue; text-decoration: underline;">=0Al=
izhenqiang@chinamobile.com</a><br>=0A<b>Subject:</b> RE: [OSPF] Solicit fe=
edbacks on draft-dong-ospf-maxage-flush-problem-statement</span><span lang=
=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A</div>=0A</div>=
=0A<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; mar=
gin: 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<sp=
an lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>=0A<p =
class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-si=
ze: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" sty=
le=3D"font-size:11.0pt;color:#1F497D">Jie =E2=80=93</span><span lang=3D"EN=
-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal"=
 style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-fa=
mily: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-size:11.=
0pt;color:#1F497D">&nbsp;</span><span lang=3D"EN-US" style=3D"color:black"=
><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm;=
 text-align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;=
">=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">Fully a=
gree that IS-IS and OSPF differ in this regard.</span><span lang=3D"EN-US"=
 style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" sty=
le=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family=
: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;=
color:#1F497D">&nbsp;</span><span lang=3D"EN-US" style=3D"color:black"><o:=
p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; tex=
t-align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=
=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D"><a href=
=3D"https://www.ietf.org/id/draft-ietf-isis-remaining-lifetime-01.txt" sty=
le=3D"color: blue; text-decoration: underline;">https://www.ietf.org/id/dr=
aft-ietf-isis-remaining-lifetime-01.txt</a> addresses=0A problems where co=
rruption of the remaining lifetime occurs either during transmission/recep=
tion or due to some DOS attack. This isn=E2=80=99t a concern w OSPF (hope =
you agree).</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></=
span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: j=
ustify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lan=
g=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-US" styl=
e=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D=
"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: Cal=
ibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:#1F497D">[Jie]: =
Yes, for OSPF the corruption during packet transmission can be detected.</=
span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<=
p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" s=
tyle=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span><span lang=3D"EN-US" =
style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" styl=
e=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family:=
 Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;c=
olor:#1F497D">What remains is the possibility that an implementation has s=
ome bug and unintentionally modifies the age to something other than what =
it should be due to the actual elapsed time since LSA generation.=0A I sup=
pose a mechanism equivalent to what the IS-IS draft defined i.e. setting t=
he age to =E2=80=9Cnew=E2=80=9D (0 in OSPF case) when first receiving a no=
n-self-generated LSA could be useful to prevent negative impacts of such a=
n implementation bug. Is this what you intend?</span><span lang=3D"EN-US" =
style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" styl=
e=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family:=
 Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:#1F497D">&nb=
sp;</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p=
>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; =
font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-=
US" style=3D"color:#1F497D">[Jie]: More specifically, the problem could be=
 caused by either =E2=80=9Csetting the LS age field incorrectly due to imp=
lementation bug=E2=80=9D or =E2=80=9Csystem timer runs so fast that the LS=
 age reaches MaxAge much earlier than other routers=E2=80=9D.=0A Another l=
ess likely case is that the LS age field is corrupted before the LSA is as=
sembled into OSPF packet.</span><span lang=3D"EN-US" style=3D"color:black"=
><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm;=
 text-align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;=
">=0A<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=
=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoN=
ormal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; f=
ont-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:#=
1F497D">[Jie]: Regarding the solutions space, IMO we need to consider both=
 cases: =E2=80=9CLS age reaches MaxAge=E2=80=9D and =E2=80=9CLS age close =
to MaxAge=E2=80=9D. For IS-IS, RFC 6232 and RFC 6233 provide solutions for=
 the detection and identification=0A of corrupted IS-IS purge, while OSPF =
does not have similar mechanisms.</span><span lang=3D"EN-US" style=3D"colo=
r:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: =
0px 0cm; text-align: justify; font-size: 10.5pt; font-family: Calibri, san=
s-serif;">=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D"=
>&nbsp;</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span=
></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justi=
fy; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<b><i><span l=
ang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">[Les:] It is incorr=
ect to say that RFC 6232 makes it possible to detect a corrupt purge. What=
 it does do is to provide an indication as to which IS initiated a purge. =
I don=E2=80=99t know how OSPF would=0A address this issue, but for OSPFv2 =
at least any solution would likely not be backwards compatible. For this r=
eason I suggest that you not try to address this issue in the same draft.<=
/span></i></b><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span=
></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justi=
fy; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<b><i><span l=
ang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span></i></b><span lang=3D"E=
N-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal=
" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-f=
amily: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:#1F497=
D">[Jie2]: Agreed, RFC 6232 provide the mechanism to track the misbehaved =
routers so that operator can fix the problem, the detection can be based o=
n the rules in RFC 6233 or some other anomalies. Indeed for OSPFv2 legacy=
=0A LSAs, it is difficult to introduce the mechanism similar to RFC 6232, =
while it can be easier for the OSPFv2/v3 Extended LSAs. So it depends on h=
ow backward compatible the solution should be. I agree with you that the s=
olution for Problem Localization in OSPF=0A needs to be provided in a sepa=
rate document.</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p=
></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align=
: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<b><i>=
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span=
></i></b><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=
=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; f=
ont-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<b><i><span lang=
=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">Solutions to LS age &n=
bsp;corruption can be done in a backwards compatible way, but they &nbsp;M=
UST NOT result in discarding purges which pass authentication- doing so pl=
aces you at risk for having inconsistent=0A LSDBs in the network.</span></=
i></b><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font=
-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" =
style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-US" style=3D"color:b=
lack"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px=
 0cm; text-align: justify; font-size: 10.5pt; font-family: Calibri, sans-s=
erif;">=0A<span lang=3D"EN-US" style=3D"color:#1F497D">[Jie2]: Exactly. Th=
e received MaxAge LSAs cannot simply be discarded, the decision must be ma=
de carefully, probably based on some additional information. The authors h=
as discussed some possible solution internally, and=0A will prepare some m=
aterial for further open discussion.</span><span lang=3D"EN-US" style=3D"c=
olor:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margi=
n: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F49=
7D">&nbsp;</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></s=
pan></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: ju=
stify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=
=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">As written, the draft =
makes claims that are at least misleading =E2=80=93 and I believe actually=
 incorrect. In Section 6 you say:</span><span lang=3D"EN-US" style=3D"colo=
r:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: =
0px 0cm; text-align: justify; font-size: 10.5pt; font-family: Calibri, san=
s-serif;">=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D"=
>&nbsp;</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span=
></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justi=
fy; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D=
"EN-US" style=3D"font-size:11.0pt;color:#1F497D">=E2=80=9CThe LS age field=
 may be altered as a result of</span><span lang=3D"EN-US" style=3D"color:b=
lack"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px=
 0cm; text-align: justify; font-size: 10.5pt; font-family: Calibri, sans-s=
erif;">=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&n=
bsp;&nbsp; packet corruption, such modification cannot be detected by LSA<=
/span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font=
-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" =
style=3D"font-size:11.0pt;color:#1F497D">&nbsp;&nbsp; checksum nor OSPF pa=
cket cryptographic authentication.=E2=80=9D</span><span lang=3D"EN-US" sty=
le=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=
=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: =
Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;co=
lor:#1F497D">&nbsp;</span><span lang=3D"EN-US" style=3D"color:black"><o:p>=
</o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-=
align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<=
span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">This isn=E2=
=80=99t correct.</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o=
:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-ali=
gn: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<spa=
n lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-US"=
 style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" sty=
le=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family=
: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:#1F497D">[J=
ie] Thanks for pointing out this. This sentence need to be revised to ment=
ion =E2=80=9CLSA corruption=E2=80=9D rather than =E2=80=9Cpacket corruptio=
n=E2=80=9D.</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></=
span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: j=
ustify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lan=
g=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span><span la=
ng=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"Ms=
oNormal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt;=
 font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-=
size:11.0pt;color:#1F497D">What would be helpful =E2=80=93 at least to me =
=E2=80=93 is to move from a generic problem statement to the specific prob=
lem you want to solve and the proposed solution. This also requires you to=
 more clearly state=0A the cases where there is an actual vulnerability. I=
t would be a lot easier to support the draft if this were done.</span><spa=
n lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=
=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 1=
0.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D=
"color:#1F497D">&nbsp;</span><span lang=3D"EN-US" style=3D"color:black"><o=
:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; te=
xt-align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=
=0A<span lang=3D"EN-US" style=3D"color:#1F497D">[Jie] Thanks for your sugg=
estion. Yes we can update this draft with more specific problem statements=
 as I mentioned above.=0A</span><span lang=3D"EN-US" style=3D"color:black"=
><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm;=
 text-align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;=
">=0A<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=
=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoN=
ormal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; f=
ont-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:#=
1F497D">[Jie] As for the proposed solutions, the current draft specifies t=
he requirements on the potential solutions, from which we envision that di=
fferent solutions maybe needed for =E2=80=9CImpact Mitigation=E2=80=9D and=
 =E2=80=9CProblem Localization=E2=80=9D.=0A The solution for =E2=80=9CImpa=
ct mitigation=E2=80=9D can be the easier one, for which we can start to di=
scuss the potential solutions now. While the solution for =E2=80=9Cproblem=
 localization=E2=80=9D may need more considerations.</span><span lang=3D"E=
N-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal=
" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-f=
amily: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:#1F497=
D">&nbsp;</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></sp=
an></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: jus=
tify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<b><i><span=
 lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">[Les:] A discussi=
on of the requirements is useful and necessary, but IMO until you propose =
a solution there isn=E2=80=99t enough substance for the document to become=
 a WG document.</span></i></b><span lang=3D"EN-US" style=3D"color:black"><=
o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; t=
ext-align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=
=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</s=
pan><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p=
 class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-s=
ize: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" st=
yle=3D"font-size:11.0pt;color:#1F497D">[Jie2] Yes the current draft focuse=
s on the problem statement and the requirements, the goal is to firstly ge=
t the MaxAge flush problem acknowledged and reach consensus on the require=
ments. Then the=0A plan is to specify the solutions in separate documents.=
&nbsp; Your valuable suggestions will be considered, and further contribut=
ions are welcome.</span><span lang=3D"EN-US" style=3D"color:black"><o:p></=
o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-al=
ign: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<sp=
an lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span><s=
pan lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=
=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 1=
0.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D=
"font-size:11.0pt;color:#1F497D">Best regards,</span><span lang=3D"EN-US" =
style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" styl=
e=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family:=
 Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;c=
olor:#1F497D">Jie</span><span lang=3D"EN-US" style=3D"color:black"><o:p></=
o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-al=
ign: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<b>=
<i><span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</s=
pan></i></b><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span><=
/p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify=
; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<b><i><span lan=
g=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;&nbsp;&nbsp; Le=
s</span></i></b><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></sp=
an></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: jus=
tify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=
=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span><span lan=
g=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"Mso=
Normal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; =
font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:=
#1F497D">Best regards,</span><span lang=3D"EN-US" style=3D"color:black"><o=
:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; te=
xt-align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=
=0A<span lang=3D"EN-US" style=3D"color:#1F497D">Jie</span><span lang=3D"EN=
-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal"=
 style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-fa=
mily: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-size:11.=
0pt;color:#1F497D">&nbsp;</span><span lang=3D"EN-US" style=3D"color:black"=
><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm;=
 text-align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;=
">=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;&=
nbsp; Les</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></sp=
an></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: jus=
tify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=
=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span><span lan=
g=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"Mso=
Normal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; =
font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-s=
ize:11.0pt;color:#1F497D">&nbsp;</span><span lang=3D"EN-US" style=3D"color=
:black"><o:p></o:p></span></p>=0A<div style=3D"border:none;border-left:sol=
id blue 1.5pt;padding:0cm 0cm 0cm 4.0pt">=0A<div>=0A<div style=3D"border:n=
one;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">=0A<p class=
=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin: 0px 0c=
m; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<b><span lang=
=3D"EN-US" style=3D"font-size: 10pt; font-family: Tahoma, sans-serif; colo=
r: black;">From:</span></b><span lang=3D"EN-US" style=3D"font-size: 10pt; =
font-family: Tahoma, sans-serif; color: black;"> Dongjie (Jimmy) [<a href=
=3D"mailto:jie.dong@huawei.com" style=3D"color: blue; text-decoration: und=
erline;">mailto:jie.dong@huawei.com</a>]=0A<br>=0A<b>Sent:</b> Sunday, Jul=
y 31, 2016 11:48 PM<br>=0A<b>To:</b> Les Ginsberg (ginsberg); <a href=3D"m=
ailto:ospf@ietf.org" style=3D"color: blue; text-decoration: underline;">=
=0Aospf@ietf.org</a><br>=0A<b>Cc:</b> Zhangxudong (zhangxudong, VRP); <a h=
ref=3D"mailto:lizhenqiang@chinamobile.com" style=3D"color: blue; text-deco=
ration: underline;">=0Alizhenqiang@chinamobile.com</a><br>=0A<b>Subject:</=
b> RE: [OSPF] Solicit feedbacks on draft-dong-ospf-maxage-flush-problem-st=
atement</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span=
></p>=0A</div>=0A</div>=0A<p class=3D"MsoNormal" align=3D"left" style=3D"t=
ext-align: justify; margin: 0px 0cm; font-size: 10.5pt; font-family: Calib=
ri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p>=
</o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-=
align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<=
span lang=3D"EN-US" style=3D"color:#1F497D">Hi Les, </span><span lang=3D"E=
N-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal=
" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-f=
amily: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:#1F497=
D">&nbsp;</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></sp=
an></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: jus=
tify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=
=3D"EN-US" style=3D"color:#1F497D">Thanks for your comments.</span><span l=
ang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"M=
soNormal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt=
; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"colo=
r:#1F497D">&nbsp;</span><span lang=3D"EN-US" style=3D"color:black"><o:p></=
o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-al=
ign: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<sp=
an lang=3D"EN-US" style=3D"color:#1F497D">OSPF packet level checksum and a=
uthentication can only protect the assembled LSU packet one hop on the wir=
e, while cannot detect any change to LSA made by the routers. This is beca=
use the OSPF packets are re-assembled=0A on each hop, which is slightly di=
fferent from IS-IS. So the problem for OSPF is mainly due to the problems =
inside the router, for example protocol implementations, system timers, or=
 some hardware problem. Actually this problem has been seen in several pro=
duction=0A networks.</span><span lang=3D"EN-US" style=3D"color:black"><o:p=
></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text=
-align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A=
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN=
-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal"=
 style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-fa=
mily: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:#1F497D=
">We can improve the description in the draft to make this clear.</span><s=
pan lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=
=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 1=
0.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D=
"color:#1F497D">&nbsp;</span><span lang=3D"EN-US" style=3D"color:black"><o=
:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; te=
xt-align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=
=0A<span lang=3D"EN-US" style=3D"color:#1F497D">Best regards,</span><span =
lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"=
MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5p=
t; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"col=
or:#1F497D">Jie</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:=
p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-alig=
n: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span=
 lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-US" =
style=3D"color:black"><o:p></o:p></span></p>=0A<div>=0A<div style=3D"borde=
r:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">=0A<p cla=
ss=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin: 0px =
0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<b><span lan=
g=3D"EN-US" style=3D"font-size: 10pt; font-family: Tahoma, sans-serif; col=
or: black;">From:</span></b><span lang=3D"EN-US" style=3D"font-size: 10pt;=
 font-family: Tahoma, sans-serif; color: black;"> Les Ginsberg (ginsberg) =
[<a href=3D"mailto:ginsberg@cisco.com" style=3D"color: blue; text-decorati=
on: underline;">mailto:ginsberg@cisco.com</a>]=0A<br>=0A<b>Sent:</b> Monda=
y, August 01, 2016 1:30 PM<br>=0A<b>To:</b> Dongjie (Jimmy); <a href=3D"ma=
ilto:ospf@ietf.org" style=3D"color: blue; text-decoration: underline;">=0A=
ospf@ietf.org</a><br>=0A<b>Cc:</b> Zhangxudong (zhangxudong, VRP); <a href=
=3D"mailto:lizhenqiang@chinamobile.com" style=3D"color: blue; text-decorat=
ion: underline;">=0Alizhenqiang@chinamobile.com</a><br>=0A<b>Subject:</b> =
RE: [OSPF] Solicit feedbacks on draft-dong-ospf-maxage-flush-problem-state=
ment</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></=
p>=0A</div>=0A</div>=0A<p class=3D"MsoNormal" align=3D"left" style=3D"text=
-align: justify; margin: 0px 0cm; font-size: 10.5pt; font-family: Calibri,=
 sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o=
:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-ali=
gn: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<spa=
n lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">Jie =E2=80=93</s=
pan><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p=
 class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-s=
ize: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" st=
yle=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span><span lang=3D"EN-US" s=
tyle=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=
=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: =
Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;co=
lor:#1F497D">The draft says (Section 2):</span><span lang=3D"EN-US" style=
=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"=
margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: Cali=
bri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:=
#1F497D">&nbsp;</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:=
p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-alig=
n: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span=
 lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">=E2=80=9CSince cr=
yptographic authentication is executed at the OSPF packet</span><span lang=
=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoN=
ormal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; f=
ont-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-si=
ze:11.0pt;color:#1F497D">&nbsp;&nbsp; level, it can only protect the assem=
bled LSU packet for one hop and</span><span lang=3D"EN-US" style=3D"color:=
black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0p=
x 0cm; text-align: justify; font-size: 10.5pt; font-family: Calibri, sans-=
serif;">=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&=
nbsp;&nbsp; does not provide any additional protection for the corruption =
of LS</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span><=
/p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify=
; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"E=
N-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;&nbsp; age field.=E2=
=80=9D</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span>=
</p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justif=
y; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"=
EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span><span lang=3D=
"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNorm=
al" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font=
-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-size:=
11.0pt;color:#1F497D">But as authentication is calculated at the OSPF pack=
et level, any change to the LS age field for an individual LSA contained w=
ithin the OSPF packet (e.g. by some packet corruption in transmission) wou=
ld=0A cause authentication to fail when the packet is received. So the sta=
tement you make is not correct. I therefore am struggling to understand wh=
at problem you believe is not addressed by existing authentication techniq=
ues.</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></=
p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify;=
 font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN=
-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span><span lang=3D"E=
N-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal=
" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-f=
amily: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-size:11=
.0pt;color:#1F497D">&nbsp;&nbsp; Les</span><span lang=3D"EN-US" style=3D"c=
olor:black"><o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margi=
n: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F49=
7D">&nbsp;</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></s=
pan></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: ju=
stify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=
=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span><span lan=
g=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>=0A<p class=3D"Mso=
Normal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; =
font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"font-s=
ize:11.0pt;color:#1F497D">&nbsp;</span><span lang=3D"EN-US" style=3D"color=
:black"><o:p></o:p></span></p>=0A<div style=3D"border:none;border-left:sol=
id blue 1.5pt;padding:0cm 0cm 0cm 4.0pt">=0A<div>=0A<div style=3D"border:n=
one;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">=0A<p class=
=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin: 0px 0c=
m; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<b><span lang=
=3D"EN-US" style=3D"font-size: 10pt; font-family: Tahoma, sans-serif; colo=
r: black;">From:</span></b><span lang=3D"EN-US" style=3D"font-size: 10pt; =
font-family: Tahoma, sans-serif; color: black;"> OSPF [<a href=3D"mailto:o=
spf-bounces@ietf.org" style=3D"color: blue; text-decoration: underline;">m=
ailto:ospf-bounces@ietf.org</a>]=0A<b>On Behalf Of </b>Dongjie (Jimmy)<br>=
=0A<b>Sent:</b> Sunday, July 31, 2016 8:15 PM<br>=0A<b>To:</b> <a href=3D"=
mailto:ospf@ietf.org" style=3D"color: blue; text-decoration: underline;">=
=0Aospf@ietf.org</a><br>=0A<b>Cc:</b> Zhangxudong (zhangxudong, VRP); <a h=
ref=3D"mailto:lizhenqiang@chinamobile.com" style=3D"color: blue; text-deco=
ration: underline;">=0Alizhenqiang@chinamobile.com</a><br>=0A<b>Subject:</=
b> [OSPF] Solicit feedbacks on draft-dong-ospf-maxage-flush-problem-statem=
ent</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p=
>=0A</div>=0A</div>=0A<p class=3D"MsoNormal" align=3D"left" style=3D"text-=
align: justify; margin: 0px 0cm; font-size: 10.5pt; font-family: Calibri, =
sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:=
p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-alig=
n: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span=
 lang=3D"EN-US" style=3D"color:black">Hi all,<o:p></o:p></span></p>=0A<p c=
lass=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-siz=
e: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" styl=
e=3D"color:black">&nbsp;<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" st=
yle=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-famil=
y: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:black">dra=
ft-dong-ospf-maxage-flush-problem-statement describes the problems caused =
by the corruption of the LS Age field, and summarizes the requirements on =
potential solutions. This draft received good comments during the presenta=
tion=0A on the IETF meeting in B.A.<o:p></o:p></span></p>=0A<p class=3D"Ms=
oNormal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt;=
 font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color=
:black">&nbsp;<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"mar=
gin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: Calibri=
, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:black">The authors w=
ould like to solicit further feedbacks from the mailing list, on both the =
problem statement and the solution requirements. Based on the feedbacks, w=
e will update the problem statement draft, and work together=0A to build s=
uitable solutions. <o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=
=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: =
Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:black">&nbsp;=
<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; =
text-align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;"=
>=0A<span lang=3D"EN-US" style=3D"color:black">The URL of the draft is:<o:=
p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; tex=
t-align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;">=
=0A<span lang=3D"EN-US" style=3D"color:black"><a href=3D"https://tools.iet=
f.org/html/draft-dong-ospf-maxage-flush-problem-statement-00" style=3D"col=
or: blue; text-decoration: underline;">https://tools.ietf.org/html/draft-d=
ong-ospf-maxage-flush-problem-statement-00</a><o:p></o:p></span></p>=0A<p =
class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-si=
ze: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" sty=
le=3D"color:black">&nbsp;<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" s=
tyle=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-fami=
ly: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:black">Co=
mments &amp; feedbacks are welcome.<o:p></o:p></span></p>=0A<p class=3D"Ms=
oNormal" style=3D"margin: 0px 0cm; text-align: justify; font-size: 10.5pt;=
 font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color=
:black">&nbsp;<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"mar=
gin: 0px 0cm; text-align: justify; font-size: 10.5pt; font-family: Calibri=
, sans-serif;">=0A<span lang=3D"EN-US" style=3D"color:black">Best regards,=
<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; =
text-align: justify; font-size: 10.5pt; font-family: Calibri, sans-serif;"=
>=0A<span lang=3D"EN-US" style=3D"color:black">Jie<o:p></o:p></span></p>=
=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; f=
ont-size: 10.5pt; font-family: Calibri, sans-serif;">=0A<span lang=3D"EN-U=
S" style=3D"color:black">&nbsp;<o:p></o:p></span></p>=0A</div>=0A</div>=0A=
</div>=0A</div>=0A</div>=0A</div>=0A</div>=0A</div>=0A</blockquote>=0A</di=
v>=0A</div>=0A</blockquote>=0A</div>=0A</div>=0A</div>=0A</blockquote>=0A<=
/div>=0A</div>=0A</blockquote>=0A</span></div>=0A</div>=0A</blockquote>=0A=
</div>=0A</div>=0A</blockquote>=0A</span>=0A</div></div></blockquote>=0A</=
body></html>
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Date: Mon, 17 Oct 2016 12:19:21 +0800
From: Huang Yongliang <huangyl29@chinaunicom.cn>
To: acee <acee@cisco.com>, List <ospf@ietf.org>
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Subject: Re: [OSPF] FW: Solicit feedbacks on draft-dong-ospf-maxage-flush-problem-statement
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------=_002_NextPart404788701072_=----
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf-8">
<style>body { line-height: 1.5; }blockquote { margin-top: 0px; margin-botto=
m: 0px; margin-left: 0.5em; }p { margin-top: 0px; margin-bottom: 0px; }div.=
foxdiv20161017121320915531 { word-wrap: break-word; -webkit-line-break: aft=
er-white-space; color: rgb(0, 0, 0); font-size: 14px; font-family: CALIBRI,=
 sans-serif; }body { font-size: 10.5pt; font-family: =E5=BE=AE=E8=BD=AF=E9=
=9B=85=E9=BB=91; color: rgb(0, 0, 0); line-height: 1.5; }</style>
</head>
<body>
<table width=3D"99.99%" height=3D"100%" style=3D"padding: 10px; background-=
color: transparent;" border=3D"0" cellpadding=3D"0" cellspacing=3D"0" backg=
round=3D"cid:_Foxmail.1@9c98ade0-8650-2752-cee1-d721e0673ac4">
<tbody>
<tr>
<td valign=3D"top" style=3D"width:100%;height:100%;">
<div style=3D"">
<div><font face=3D"CALIBRI, sans-serif"><span style=3D"font-size: 14px;">Hi=
=EF=BC=8Call=EF=BC=8C<br>
<br>
</span></font></div>
<div><font face=3D"CALIBRI, sans-serif"><span style=3D"font-size: 14px;">&n=
bsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Although&nbsp;the&nbsp;proble=
m&nbsp;described&nbsp;in&nbsp;this&nbsp;draft&nbsp;would&nbsp;not&nbsp;happ=
en&nbsp;quite&nbsp;often,&nbsp;it&nbsp;could&nbsp;have&nbsp;severe&nbsp;imp=
acts&nbsp;to&nbsp;operator=E2=80=99s&nbsp;network&nbsp;with&nbsp;all&nbsp;t=
he&nbsp;services&nbsp;carried&nbsp;on&nbsp;it.<br>
&nbsp;<br>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;From&nbsp;my&nbsp;point&nbs=
p;of&nbsp;view&nbsp;as&nbsp;an&nbsp;operator,&nbsp;robustness&nbsp;is&nbsp;=
a&nbsp;fundamental&nbsp;requirement&nbsp;to&nbsp;the&nbsp;network.&nbsp;If&=
nbsp;such&nbsp;kind&nbsp;of&nbsp;problem&nbsp;happens&nbsp;but&nbsp;could&n=
bsp;not&nbsp;be&nbsp;fixed&nbsp;quickly&nbsp;or&nbsp;alleviated,&nbsp;IMO&n=
bsp;that=E2=80=99s&nbsp;unacceptable&nbsp;to&nbsp;any&nbsp;operator.<br>
&nbsp;<br>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;So,&nbsp;I&nbsp;support&nbs=
p;this&nbsp;document&nbsp;to&nbsp;be&nbsp;adopted.</span></font></div>
<div><font face=3D"CALIBRI, sans-serif"><span style=3D"font-size: 14px;"><b=
r>
</span></font></div>
<div><span>
<div style=3D"line-height: normal;"><font face=3D"CALIBRI, sans-serif"><spa=
n style=3D"font-size: 14px;"><br>
</span></font></div>
<div style=3D"line-height: normal;"><font face=3D"CALIBRI, sans-serif"><spa=
n style=3D"font-size: 14px;"><br>
</span></font></div>
<div style=3D"line-height: normal;"><font face=3D"CALIBRI, sans-serif"><spa=
n style=3D"font-size: 14px;"><br>
</span></font></div>
<div style=3D"line-height: normal;"><font face=3D"CALIBRI, sans-serif"><spa=
n style=3D"font-size: 14px;">Best Regards</span></font></div>
<div style=3D"line-height: normal;"><font face=3D"CALIBRI, sans-serif"><spa=
n style=3D"font-size: 14px;">Huang Yongliang</span></font></div>
<div style=3D"line-height: normal;"><font color=3D"#000000" face=3D"CALIBRI=
, sans-serif"><span style=3D"font-size: 14px;"><a href=3D"mailto:huangyl29@=
chinaunicom.cn" segoeui?,tahoma?;font-size:14px;font-weight:normal;font-sty=
le:normal;?=3D"" style=3D"line-height: 1.5;">huangyl29@chinaunicom.cn</a><s=
pan segoeui?,tahoma?;font-size:14px;color:rgb(0,0,0);background-color:rgba(=
0,font-weight:normal;font-style:normal;text-decoration:none;?=3D"" style=3D=
"line-height: 1.5;">&nbsp;</span></span></font></div>
<div style=3D"font-family: 'Segoe UI', Tahoma; line-height: normal;"><span =
segoeui?,tahoma?;font-size:14px;color:rgb(0,0,0);background-color:rgba(0,fo=
nt-weight:normal;font-style:normal;text-decoration:none;?=3D"" style=3D"bac=
kground-color: transparent; font-family: ''; font-size: 10.5pt; line-height=
: 1.5;"><br>
</span></div>
<div style=3D"font-family: 'Segoe UI', Tahoma; line-height: normal;"><span =
segoeui?,tahoma?;font-size:14px;color:rgb(0,0,0);background-color:rgba(0,fo=
nt-weight:normal;font-style:normal;text-decoration:none;?=3D"" style=3D"bac=
kground-color: transparent; font-family: ''; font-size: 10.5pt; line-height=
: 1.5;"><br>
</span></div>
<div style=3D"font-family: 'Segoe UI', Tahoma; line-height: normal;"><span =
segoeui?,tahoma?;font-size:14px;color:rgb(0,0,0);background-color:rgba(0,fo=
nt-weight:normal;font-style:normal;text-decoration:none;?=3D"" style=3D"bac=
kground-color: transparent; font-family: ''; font-size: 10.5pt; line-height=
: 1.5;"><br>
</span></div>
<div style=3D"font-family: 'Segoe UI', Tahoma; line-height: normal;"><span =
segoeui?,tahoma?;font-size:14px;color:rgb(0,0,0);background-color:rgba(0,fo=
nt-weight:normal;font-style:normal;text-decoration:none;?=3D"" style=3D"bac=
kground-color: transparent; font-family: ''; font-size: 10.5pt; line-height=
: 1.5;"><br>
</span></div>
<div style=3D"font-family: 'Segoe UI', Tahoma; line-height: normal;"><span =
segoeui?,tahoma?;font-size:14px;color:rgb(0,0,0);background-color:rgba(0,fo=
nt-weight:normal;font-style:normal;text-decoration:none;?=3D"" style=3D"bac=
kground-color: transparent; font-family: ''; font-size: 10.5pt; line-height=
: 1.5;"><br>
</span></div>
</span><span style=3D"font-family: &quot;" segoeui?,tahoma?;font-size:14px;=
color:rgb(0,0,0);background-color:rgba(0,font-weight:normal;font-style:norm=
al;text-decoration:none;?=3D""></span></div>
<blockquote style=3D"margin-top: 0px; margin-bottom: 0px; margin-left: 0.5e=
m;">
<div>&nbsp;</div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<div style=3D"PADDING-RIGHT: 8px; PADDING-LEFT: 8px; FONT-SIZE: 12px;FONT-F=
AMILY:tahoma;COLOR:#000000; BACKGROUND: #efefef; PADDING-BOTTOM: 8px; PADDI=
NG-TOP: 8px">
<div><b>From:</b>&nbsp;<a href=3D"mailto:acee@cisco.com">Acee Lindem (acee)=
</a></div>
<div><b>Date:</b>&nbsp;2016-10-12&nbsp;02:51</div>
<div><b>To:</b>&nbsp;<a href=3D"mailto:ospf@ietf.org">OSPF WG List</a></div=
>
<div><b>Subject:</b>&nbsp;[OSPF] FW: Solicit feedbacks on draft-dong-ospf-m=
axage-flush-problem-statement</div>
</div>
</div>
<div>
<div class=3D"FoxDiv20161017121320915531">
<div>Speaking as WG Co-Chair:</div>
<div><br>
</div>
<div>We had a quite a lengthy discussion on this problem and whether or it =
is something the WG should adopt. Please indicate whether or not you would =
support WG adoption before Oct 26th, 2016. &nbsp;</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Acee&nbsp;</div>
<div><br>
</div>
<span id=3D"OLK_SRC_BODY_SECTION">
<div style=3D"font-family:Calibri; font-size:11pt; text-align:left; color:b=
lack; BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM:=
 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid;=
 BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<span style=3D"font-weight:bold">From: </span>&quot;<a href=3D"mailto:lizhe=
nqiang@chinamobile.com">lizhenqiang@chinamobile.com</a>&quot; &lt;<a href=
=3D"mailto:lizhenqiang@chinamobile.com">lizhenqiang@chinamobile.com</a>&gt;=
<br>
<span style=3D"font-weight:bold">Date: </span>Thursday, August 25, 2016 at =
9:29 PM<br>
<span style=3D"font-weight:bold">To: </span>Acee Lindem &lt;<a href=3D"mail=
to:acee@cisco.com">acee@cisco.com</a>&gt;, Jie Dong &lt;<a href=3D"mailto:j=
ie.dong@huawei.com">jie.dong@huawei.com</a>&gt;, &quot;Les Ginsberg (ginsbe=
rg)&quot; &lt;<a href=3D"mailto:ginsberg@cisco.com">ginsberg@cisco.com</a>&=
gt;,
 OSPF WG List &lt;<a href=3D"mailto:ospf@ietf.org">ospf@ietf.org</a>&gt;<br=
>
<span style=3D"font-weight:bold">Cc: </span>&quot;Zhangxudong (zhangxudong,=
 VRP)&quot; &lt;<a href=3D"mailto:zhangxudong@huawei.com">zhangxudong@huawe=
i.com</a>&gt;<br>
<span style=3D"font-weight:bold">Subject: </span>Re: Re: [OSPF] Solicit fee=
dbacks on draft-dong-ospf-maxage-flush-problem-statement<br>
</div>
<div><br>
</div>
<blockquote id=3D"MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE" style=3D"border-left-=
color: rgb(181, 196, 223); border-left-width: 5px; border-left-style: solid=
; padding: 0px 0px 0px 5px; margin: 0px 0px 0px 0.5em;">
<div>
<div>
<div><span></span>Hi Acee,</div>
<div><br>
</div>
<div>Totally agree with you that we have to avoid significant modification =
to OSPF.&nbsp;</div>
<div><br>
</div>
<div>The common point after the mail discussion is production network runni=
ng OSPF DOES have some problems due to software implementation bugs or hard=
ware defects. Those production network problems deserve some proposals both=
 to identify the router with bugs
 and to mitigate the problem, for example to reduce th impact of OSPF route=
 flapping.</div>
<div><br>
</div>
<div>Your suggestion is one option about defective router identification. T=
hank you very much.</div>
<div><br>
</div>
<div>Best Regards,</div>
<hr style=3D"width: 210px; height: 1px;" color=3D"#b5c4df" size=3D"1" align=
=3D"left">
<div><span>
<div style=3D"MARGIN: 10px; FONT-FAMILY: verdana; FONT-SIZE: 10pt">
<div><a href=3D"mailto:lizhenqiang@chinamobile.com">lizhenqiang@chinamobile=
.com</a></div>
</div>
</span></div>
<blockquote style=3D"margin-top: 0px; margin-bottom: 0px; margin-left: 0.5e=
m;">
<div>&nbsp;</div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<div style=3D"PADDING-RIGHT: 8px; PADDING-LEFT: 8px; FONT-SIZE: 12px;FONT-F=
AMILY:tahoma;COLOR:#000000; BACKGROUND: #efefef; PADDING-BOTTOM: 8px; PADDI=
NG-TOP: 8px">
<div><b>From:</b>&nbsp;<a href=3D"mailto:acee@cisco.com">Acee Lindem (acee)=
</a></div>
<div><b>Date:</b>&nbsp;2016-08-25&nbsp;03:04</div>
<div><b>To:</b>&nbsp;<a href=3D"mailto:lizhenqiang@chinamobile.com">lizhenq=
iang@chinamobile.com</a>;
<a href=3D"mailto:jie.dong@huawei.com">Dongjie (Jimmy)</a>; <a href=3D"mail=
to:ginsberg@cisco.com">
Les Ginsberg (ginsberg)</a>; <a href=3D"mailto:ospf@ietf.org">ospf@ietf.org=
</a></div>
<div><b>CC:</b>&nbsp;<a href=3D"mailto:zhangxudong@huawei.com">Zhangxudong =
(zhangxudong, VRP)</a></div>
<div><b>Subject:</b>&nbsp;Re: [OSPF] Solicit feedbacks on draft-dong-ospf-m=
axage-flush-problem-statement</div>
</div>
</div>
<div>
<div class=3D"FoxDiv20160826090955224101" style=3D"word-wrap: break-word; -=
webkit-line-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px;=
 font-family: CALIBRI, sans-serif;">
<div>Speaking as WG member:</div>
<div><br>
</div>
<div>Hi&nbsp;Zhenjiang,</div>
<div><br>
</div>
<div>I don=E2=80=99t doubt that this was a very disquieting experience. How=
ever, I still don=E2=80=99t think we should attempt to change the protocol =
to compensate for routers that do not adhere to the protocol. To make an an=
alogy, in my years of OSPF experience I=E2=80=99ve been
 subject to a number of bugs related to OSPF=E2=80=99s usage of local wire =
multicast (some triggered by obscure conditions such as routing and bridgin=
g on the same port). However, I=E2=80=99ve never proposed to not use local =
wire multicast. Also, after 25 years of OSPFv2,
 it doesn=E2=80=99t make sense to try and change the protocol to avoid bugs=
 in this area. As for identifying the nefarious router, I think adding a co=
unter and possibly a separate notification to the YANG model might be warra=
nted since purging a non-self-originated
 LSA should not be a common occurrence in most networks.&nbsp;</div>
<div><br>
</div>
<div>Thanks,&nbsp;</div>
<div>Acee</div>
<div>P.S. Since this is an OSPF standards list, I=E2=80=99ve purposely avoi=
ded the questions as to how this catastrophic bug made it into a production=
 network.&nbsp;</div>
<div><br>
</div>
<div><br>
</div>
<span id=3D"OLK_SRC_BODY_SECTION">
<div style=3D"font-family:Calibri; font-size:11pt; text-align:left; color:b=
lack; BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM:=
 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid;=
 BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<span style=3D"font-weight:bold">From: </span>&quot;<a href=3D"mailto:lizhe=
nqiang@chinamobile.com">lizhenqiang@chinamobile.com</a>&quot; &lt;<a href=
=3D"mailto:lizhenqiang@chinamobile.com">lizhenqiang@chinamobile.com</a>&gt;=
<br>
<span style=3D"font-weight:bold">Date: </span>Wednesday, August 24, 2016 at=
 2:11 PM<br>
<span style=3D"font-weight:bold">To: </span>Jie Dong &lt;<a href=3D"mailto:=
jie.dong@huawei.com">jie.dong@huawei.com</a>&gt;, Acee Lindem &lt;<a href=
=3D"mailto:acee@cisco.com">acee@cisco.com</a>&gt;, &quot;Les Ginsberg (gins=
berg)&quot; &lt;<a href=3D"mailto:ginsberg@cisco.com">ginsberg@cisco.com</a=
>&gt;,
 OSPF WG List &lt;<a href=3D"mailto:ospf@ietf.org">ospf@ietf.org</a>&gt;<br=
>
<span style=3D"font-weight:bold">Cc: </span>&quot;Zhangxudong (zhangxudong,=
 VRP)&quot; &lt;<a href=3D"mailto:zhangxudong@huawei.com">zhangxudong@huawe=
i.com</a>&gt;<br>
<span style=3D"font-weight:bold">Subject: </span>Re: RE: [OSPF] Solicit fee=
dbacks on draft-dong-ospf-maxage-flush-problem-statement<br>
</div>
<div><br>
</div>
<blockquote id=3D"MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE" style=3D"border-left-=
color: rgb(181, 196, 223); border-left-width: 5px; border-left-style: solid=
; padding: 0px 0px 0px 5px; margin: 0px 0px 0px 0.5em;">
<div>
<div><!--[if gte mso 9]><xml>=0A=
<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" ></o:shapedefaults>=0A=
</xml><![endif]--><!--[if gte mso 9]><xml>=0A=
<o:shapelayout v:ext=3D"edit">=0A=
<o:idmap v:ext=3D"edit" data=3D"1" ></o:idmap>=0A=
</o:shapelayout></xml><![endif]-->
<div><span></span>Hello Jie, Acee and Les,</div>
<div><br>
</div>
<div>I am a coauthor of this draft from operator China Mobile. Thank you al=
l for your discussion and suggestion in the previous mails. As you all disc=
ussed, a misbehavior OSPF router (due to software or hardware problem) can =
cause severe problem in the whole
 OSPF domain.&nbsp;</div>
<div><br>
</div>
<div>Here I want to point out that OSPF route flapping DID occour in my fie=
ld network contributed by&nbsp;<span style=3D"font-size: 10.5pt; line-heigh=
t: 1.5; background-color: window;">a misbehavior OSPF router installed. The=
 procedure to analyze and look for the
 cause were very complicated because we did not know the source of the flus=
hing. Two hours past, we could not identify the real cause and restore our =
network. The CPU utilization of OSPF routers was high, the network traffic =
decreased significantly, lots of
 tunnel down warnings raised. When we tried to shutdown one</span><span sty=
le=3D"font-size: 10.5pt; line-height: 1.5; background-color: window;">&nbsp=
;OSPF router, route flapping stopped. This router was a newly deployed one.=
 Through communication with our vendor,
 they admitted that this product had some defects in dealing with OSPF prot=
ocol. This kind of defects are difficult for us to test &nbsp;when they app=
ly for entrance in our network. Once defective products are deployed in the=
 field network, &nbsp;locating the problem
 is very hard and time consuming.&nbsp;</span></div>
<div><span style=3D"font-size: 10.5pt; line-height: 1.5; background-color: =
window;"><br>
</span></div>
<div><span style=3D"font-size: 10.5pt; line-height: 1.5; background-color: =
window;">So, I&nbsp;</span><span space=3D"0| " right-pos=3D"76|183" left-po=
s=3D"76|183" style=3D"font-size: 10.5pt; line-height: 1.5; background-color=
: window;">think it is necessary for us to solve
 the problem and improve the robustness of the protocol.</span><span class=
=3D"high-light-bg" space=3D"0| " right-pos=3D"259|51" left-pos=3D"259|51" s=
tyle=3D"font-size: 10.5pt; line-height: 1.5; background-color: window;"> At=
 least it should provide the means to help
 us locate the OSPF route flapping problem.</span></div>
<div><br>
</div>
<hr style=3D"width: 210px; height: 1px;" color=3D"#b5c4df" size=3D"1" align=
=3D"left">
<div><span>
<div style=3D"MARGIN: 10px; FONT-FAMILY: verdana; FONT-SIZE: 10pt">
<div><a href=3D"mailto:lizhenqiang@chinamobile.com">lizhenqiang@chinamobile=
.com</a></div>
</div>
</span></div>
<blockquote style=3D"margin-top: 0px; margin-bottom: 0px; margin-left: 0.5e=
m;">
<div>&nbsp;</div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<div style=3D"PADDING-RIGHT: 8px; PADDING-LEFT: 8px; FONT-SIZE: 12px;FONT-F=
AMILY:tahoma;COLOR:#000000; BACKGROUND: #efefef; PADDING-BOTTOM: 8px; PADDI=
NG-TOP: 8px">
<div><b>From:</b>&nbsp;<a href=3D"mailto:jie.dong@huawei.com" style=3D"colo=
r: blue; text-decoration: underline;">Dongjie (Jimmy)</a></div>
<div><b>Date:</b>&nbsp;2016-08-18&nbsp;17:09</div>
<div><b>To:</b>&nbsp;<a href=3D"mailto:acee@cisco.com" style=3D"color: blue=
; text-decoration: underline;">Acee Lindem (acee)</a>;
<a href=3D"mailto:ginsberg@cisco.com" style=3D"color: blue; text-decoration=
: underline;">
Les Ginsberg (ginsberg)</a>; <a href=3D"mailto:ospf@ietf.org" style=3D"colo=
r: blue; text-decoration: underline;">
ospf@ietf.org</a></div>
<div><b>CC:</b>&nbsp;<a href=3D"mailto:zhangxudong@huawei.com" style=3D"col=
or: blue; text-decoration: underline;">Zhangxudong (zhangxudong, VRP)</a>;
<a href=3D"mailto:lizhenqiang@chinamobile.com" style=3D"color: blue; text-d=
ecoration: underline;">
lizhenqiang@chinamobile.com</a></div>
<div><b>Subject:</b>&nbsp;RE: [OSPF] Solicit feedbacks on draft-dong-ospf-m=
axage-flush-problem-statement</div>
</div>
</div>
<div>
<div class=3D"FoxDiv20160825010243562836"><!--[if gte mso 9]><xml>=0A=
<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" ></o:shapedefaults>=0A=
</xml><![endif]--><!--[if gte mso 9]><xml>=0A=
<o:shapelayout v:ext=3D"edit">=0A=
<o:idmap v:ext=3D"edit" data=3D"1" ></o:idmap>=0A=
</o:shapelayout></xml><![endif]-->
<div class=3D"WordSection1" style=3D"page: WordSection1;">
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">Hi Acee, <o:p></o:p></span></p=
>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">Please see my replies inline:<=
o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<b><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Tahoma, sans=
-serif;">From:</span></b><span lang=3D"EN-US" style=3D"font-size: 10pt; fon=
t-family: Tahoma, sans-serif;"> Acee Lindem (acee) [<a href=3D"mailto:acee@=
cisco.com">mailto:acee@cisco.com</a>]
<br>
<b>Sent:</b> Thursday, August 18, 2016 2:23 AM<br>
<b>To:</b> Dongjie (Jimmy); Les Ginsberg (ginsberg); <a href=3D"mailto:ospf=
@ietf.org">
ospf@ietf.org</a><br>
<b>Cc:</b> Zhangxudong (zhangxudong, VRP); <a href=3D"mailto:lizhenqiang@ch=
inamobile.com">
lizhenqiang@chinamobile.com</a><br>
<b>Subject:</b> Re: [OSPF] Solicit feedbacks on draft-dong-ospf-maxage-flus=
h-problem-statement<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">Speaking as a WG member who has =
some experience with OSPF implementations:&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">Hi Jie,&nbsp;<o:p></o:p></span><=
/p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">Along with Les, I=E2=80=99m also=
 against progressing this draft.&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black"><o:p>&nbsp;</o:p></span></p>
</div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<b><span lang=3D"EN-US" style=3D"font-size:11.0pt;color:black">From: </span=
></b><span lang=3D"EN-US" style=3D"font-size:11.0pt;color:black">Jie Dong &=
lt;<a href=3D"mailto:jie.dong@huawei.com" style=3D"color: blue; text-decora=
tion: underline;">jie.dong@huawei.com</a>&gt;<br>
<b>Date: </b>Tuesday, August 16, 2016 at 9:56 AM<br>
<b>To: </b>Acee Lindem &lt;<a href=3D"mailto:acee@cisco.com" style=3D"color=
: blue; text-decoration: underline;">acee@cisco.com</a>&gt;, &quot;Les Gins=
berg (ginsberg)&quot; &lt;<a href=3D"mailto:ginsberg@cisco.com" style=3D"co=
lor: blue; text-decoration: underline;">ginsberg@cisco.com</a>&gt;,
 OSPF WG List &lt;<a href=3D"mailto:ospf@ietf.org" style=3D"color: blue; te=
xt-decoration: underline;">ospf@ietf.org</a>&gt;<br>
<b>Cc: </b>&quot;Zhangxudong (zhangxudong, VRP)&quot; &lt;<a href=3D"mailto=
:zhangxudong@huawei.com" style=3D"color: blue; text-decoration: underline;"=
>zhangxudong@huawei.com</a>&gt;, &quot;<a href=3D"mailto:lizhenqiang@chinam=
obile.com" style=3D"color: blue; text-decoration: underline;">lizhenqiang@c=
hinamobile.com</a>&quot;
 &lt;<a href=3D"mailto:lizhenqiang@chinamobile.com" style=3D"color: blue; t=
ext-decoration: underline;">lizhenqiang@chinamobile.com</a>&gt;<br>
<b>Subject: </b>RE: [OSPF] Solicit feedbacks on draft-dong-ospf-maxage-flus=
h-problem-statement<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black"><o:p>&nbsp;</o:p></span></p>
</div>
<blockquote style=3D"border-style: none none none solid; border-left-color:=
 rgb(181, 196, 223); border-left-width: 4.5pt; padding: 0cm 0cm 0cm 4pt; ma=
rgin: 0px 0cm 0px 0.5em;" id=3D"MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">Hi Acee, </span><span lang=3D"=
EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">Thanks a lot for your feedback=
s.</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">For packet corruption which im=
pacts the LS age before the LSAs are packed into LSU packet, I agree it is =
less likely to happen than the other cases. However I think we agree that O=
SPF authentication only protect the
 packet level corruption, which cannot help to detect the corruption at LSA=
 level.</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span>=
</p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">So, you are suggesting that LSAs=
 are corrupted in the database in such a way that the LSA Age is set exactl=
y to 0xE10? How would the implementation know that this had happened and pr=
ematurely age the packet? Database aging
 just doesn=E2=80=99t work this way (unless the implementation is particula=
rly na=C3=AFve).&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">[Jie] Actually the case is whe=
n the LSA is about to be exchanged with neighbor, during the message packin=
g the LS age is corrupted to either Maxage or a large number close to Maxag=
e. The sending router does not intend
 to do a Maxage flush, however the neighbor routers which receive the messa=
ge would treat this as a flush. This is a possible case although less likel=
y to happen than the other cases.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black"><o:p>&nbsp;</o:p></span></p>
</div>
<blockquote style=3D"border-style: none none none solid; border-left-color:=
 rgb(181, 196, 223); border-left-width: 4.5pt; padding: 0cm 0cm 0cm 4pt; ma=
rgin: 0px 0cm 0px 0.5em;" id=3D"MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">In my understanding, robustnes=
s is an important feature of network protocols, which include the robustnes=
s to errors and failures happened in the network. If there is a bug in a pa=
rticular router in the network, operator
 would not allow the whole network being impacted, which means other router=
s in the network needs to work properly in this situation. For example in B=
GP, the error handling mechanism has been optimized to avoid unnecessary se=
ssion teardown.</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p=
></span></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">So you agree your problem statem=
ent is confined to a software bug resulting in LSAs being aged too quickly?=
 I think this is the third time I=E2=80=99ve raised this question.&nbsp;<o:=
p></o:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">[Jie] As I said before, the pr=
oblems happened in the production network are caused by software bug in LSA=
 aging, so I think this is the major case.
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">If it has such a problem (whethe=
r it be due to a system timer bug or a some more specific aging problem), i=
t seems the router would also be refreshing its LSAs all too frequently (at=
 least at twice the rate) and it would
 be readily identifiable. For a system time problem, the router would likel=
y have many other problems. For example, it would not maintain OSPF adjacen=
cies if the dead timer advances fast enough. It would retransmit at a very =
fast rate as well. Are you going
 to write problem statements and suggest solutions for these situations as =
well?&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">[Jie] This depends on the impl=
ementation. the software bug may only impact the aging of LSAs received fro=
m other routers. And frequent LSA refreshing may be caused by other cases s=
uch as link oscillation. &nbsp;For a system
 timer problem, OSPF adjacency may oscillate, but if the management connect=
ion is impacted, such oscillation is difficult to be identified.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">What about other bugs? What if t=
he router erroneously specifies a neighbor=E2=80=99s router-id as its own i=
n a Router-LSA? Is this a problem the protocol should handle?&nbsp;<o:p></o=
:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">[Jie] Depends on the significa=
nce to network, case by case analysis may be needed.
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black"><o:p>&nbsp;</o:p></span></p>
</div>
<blockquote style=3D"border-style: none none none solid; border-left-color:=
 rgb(181, 196, 223); border-left-width: 4.5pt; padding: 0cm 0cm 0cm 4pt; ma=
rgin: 0px 0cm 0px 0.5em;" id=3D"MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">I agree that OSPF Yang notific=
ation for LSA timeout is a nice thing to have and could be useful to identi=
fy the misbehaved router. My concern is sometimes the network may be severe=
ly impacted that the connectivity of
 netconf/restconf is also impacted. To avoid this, some mechanism to mitiga=
te the impact of this problem could help.</span><span lang=3D"EN-US" style=
=3D"color:black"><o:p></o:p></span></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">I believe a router have such imp=
act would be easy to identify=E2=80=A6&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">[Jie] According to the feedbac=
k from on-site engineers, when IGP routing is oscillating severely which ma=
kes the management connection unavailable, it usually takes much longer tim=
e for troubleshooting, as logging to
 any router cannot be done via the management network. So maybe it would be=
 better to have some automatic mechanism to reduce the impact before it bec=
omes a big problem to troubleshoot.<o:p></o:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">Best regards,<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">Jie<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">Thanks,<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">Acee&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black"><o:p>&nbsp;</o:p></span></p>
</div>
<blockquote style=3D"border-style: none none none solid; border-left-color:=
 rgb(181, 196, 223); border-left-width: 4.5pt; padding: 0cm 0cm 0cm 4pt; ma=
rgin: 0px 0cm 0px 0.5em;" id=3D"MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">Best regards,</span><span lang=
=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">Jie</span><span lang=3D"EN-US"=
 style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<b><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Tahoma, sans=
-serif; color: black;">From:</span></b><span lang=3D"EN-US" style=3D"font-s=
ize: 10pt; font-family: Tahoma, sans-serif; color: black;"> Acee Lindem (ac=
ee) [<a href=3D"mailto:acee@cisco.com" style=3D"color: blue; text-decoratio=
n: underline;">mailto:acee@cisco.com</a>]
<br>
<b>Sent:</b> Saturday, August 13, 2016 3:27 AM<br>
<b>To:</b> Les Ginsberg (ginsberg); Dongjie (Jimmy); <a href=3D"mailto:ospf=
@ietf.org" style=3D"color: blue; text-decoration: underline;">
ospf@ietf.org</a><br>
<b>Cc:</b> Zhangxudong (zhangxudong, VRP); <a href=3D"mailto:lizhenqiang@ch=
inamobile.com" style=3D"color: blue; text-decoration: underline;">
lizhenqiang@chinamobile.com</a><br>
<b>Subject:</b> Re: [OSPF] Solicit feedbacks on draft-dong-ospf-maxage-flus=
h-problem-statement</span><span lang=3D"EN-US" style=3D"color:black"><o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">Speaking as a WG member:&nbsp;<o=
:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">Hi Jie,&nbsp;<o:p></o:p></span><=
/p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">I believe we agree that the prob=
lem is confined to OSPF bugs, system timer bugs, &nbsp;and packet corruptio=
n. I=E2=80=99d assert that corruption can be detected via OSPF authenticati=
on. In fact, there is a well-known antidote where
 IS-IS authentication was enabled solely for the purpose of filtering corru=
pted protocol packets in an environment with line cards that were prone to =
such corruption. Hence, we are left with problems based on OSPF or system t=
imer bugs. If there were a system
 timer bug, I=E2=80=99d doubt that networking device with such a bug would =
be functional to the point of being able to establish and maintaining OSPF =
adjacencies.&nbsp;&nbsp;Do we really want to enhance the protocol to deal w=
ith bugs?&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">I=E2=80=99ve thought about this =
and one potential action I could envision would be to add a separate OSPF Y=
ANG notification where an LSA times out and a router other than the origina=
tor purges it. This way, the misbehaving OSPF
 router could be readily identified.&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">Thanks,<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">Acee&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<b><span lang=3D"EN-US" style=3D"font-size:11.0pt;color:black">From: </span=
></b><span lang=3D"EN-US" style=3D"font-size:11.0pt;color:black">OSPF &lt;<=
a href=3D"mailto:ospf-bounces@ietf.org" style=3D"color: blue; text-decorati=
on: underline;">ospf-bounces@ietf.org</a>&gt; on behalf
 of &quot;Les Ginsberg (ginsberg)&quot; &lt;<a href=3D"mailto:ginsberg@cisc=
o.com" style=3D"color: blue; text-decoration: underline;">ginsberg@cisco.co=
m</a>&gt;<br>
<b>Date: </b>Thursday, August 11, 2016 at 1:29 PM<br>
<b>To: </b>Jie Dong &lt;<a href=3D"mailto:jie.dong@huawei.com" style=3D"col=
or: blue; text-decoration: underline;">jie.dong@huawei.com</a>&gt;, OSPF WG=
 List &lt;<a href=3D"mailto:ospf@ietf.org" style=3D"color: blue; text-decor=
ation: underline;">ospf@ietf.org</a>&gt;<br>
<b>Cc: </b>&quot;Zhangxudong (zhangxudong, VRP)&quot; &lt;<a href=3D"mailto=
:zhangxudong@huawei.com" style=3D"color: blue; text-decoration: underline;"=
>zhangxudong@huawei.com</a>&gt;, &quot;<a href=3D"mailto:lizhenqiang@chinam=
obile.com" style=3D"color: blue; text-decoration: underline;">lizhenqiang@c=
hinamobile.com</a>&quot;
 &lt;<a href=3D"mailto:lizhenqiang@chinamobile.com" style=3D"color: blue; t=
ext-decoration: underline;">lizhenqiang@chinamobile.com</a>&gt;<br>
<b>Subject: </b>Re: [OSPF] Solicit feedbacks on draft-dong-ospf-maxage-flus=
h-problem-statement</span><span lang=3D"EN-US" style=3D"color:black"><o:p><=
/o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>
</div>
<blockquote style=3D"border-style: none none none solid; border-left-color:=
 rgb(181, 196, 223); border-left-width: 4.5pt; padding: 0cm 0cm 0cm 4pt; ma=
rgin: 0px 0cm 0px 0.5em;" id=3D"MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">Jie =E2=80=93=
</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">Having the di=
scussion has certainly been a good thing, but if the consensus of the WG is=
 that there is no protocol change required then there is no need for any dr=
aft =E2=80=93 which is my current position.</span><span lang=3D"EN-US" styl=
e=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">The other poi=
nt is that you seem to be confusing the IS-IS Purge origination TLV (RFC 62=
32) with detecting invalid purges/remaining lifetime corruption. This is no=
t the case. RFC 6232 simply allows us
 to detect which router originated a purge =E2=80=93 it is not able to dete=
ct whether a purge is valid/invalid =E2=80=93 and was not motivated by conc=
erns about remaining lifetime corruption.</span><span lang=3D"EN-US" style=
=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;&nbsp; =
Les</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<b><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Tahoma, sans=
-serif; color: black;">From:</span></b><span lang=3D"EN-US" style=3D"font-s=
ize: 10pt; font-family: Tahoma, sans-serif; color: black;"> Dongjie (Jimmy)=
 [<a href=3D"mailto:jie.dong@huawei.com" style=3D"color: blue; text-decorat=
ion: underline;">mailto:jie.dong@huawei.com</a>]
<br>
<b>Sent:</b> Wednesday, August 10, 2016 9:24 PM<br>
<b>To:</b> Les Ginsberg (ginsberg); <a href=3D"mailto:ospf@ietf.org" style=
=3D"color: blue; text-decoration: underline;">
ospf@ietf.org</a><br>
<b>Cc:</b> Zhangxudong (zhangxudong, VRP); <a href=3D"mailto:lizhenqiang@ch=
inamobile.com" style=3D"color: blue; text-decoration: underline;">
lizhenqiang@chinamobile.com</a><br>
<b>Subject:</b> RE: [OSPF] Solicit feedbacks on draft-dong-ospf-maxage-flus=
h-problem-statement</span><span lang=3D"EN-US" style=3D"color:black"><o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">Hi Les,</span=
><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">The current d=
raft is about problem statement, so IMO what the WG needs to consider is wh=
ether this is a vulnerability of OSPF protocol, and whether it can have neg=
ative impact to the network. If the
 problem is acknowledged, IMO it is worth to be documented.</span><span lan=
g=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">The =E2=80=9C=
ROI=E2=80=9D as you mentioned is for the evaluation of the proposed solutio=
ns. I totally agree that for the timer bug case, recognizing and ignoring t=
he received abnormal Maxage LSAs cannot stop the misbehaved
 router from generating further Maxage LSA, as it is a systematic problem, =
which can only be fixed after the operator identifies that router. This is =
also similar to the systematic corruption of IS-IS remain time. &nbsp;And t=
his is why this draft mentions two kinds
 of potential solutions, the mitigation mechanism can avoid the network bei=
ng severely impacted by the problem, while for systematic problems, problem=
 localization is needed to identify the misbehaved router and then solve th=
e problem.</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">Best regards,</span><span lang=
=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">Jie</span><span lang=3D"EN-US"=
 style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<b><span lang=3D"EN-US" style=3D"font-size:11.0pt;color:black">From:</span>=
</b><span lang=3D"EN-US" style=3D"font-size:11.0pt;color:black"> OSPF [<a h=
ref=3D"mailto:ospf-bounces@ietf.org" style=3D"color: blue; text-decoration:=
 underline;">mailto:ospf-bounces@ietf.org</a>]
<b>On Behalf Of </b>Les Ginsberg (ginsberg)<br>
<b>Sent:</b> Monday, August 08, 2016 2:14 AM<br>
<b>To:</b> Dongjie (Jimmy) &lt;<a href=3D"mailto:jie.dong@huawei.com" style=
=3D"color: blue; text-decoration: underline;">jie.dong@huawei.com</a>&gt;;
<a href=3D"mailto:ospf@ietf.org" style=3D"color: blue; text-decoration: und=
erline;">ospf@ietf.org</a><br>
<b>Cc:</b> Zhangxudong (zhangxudong, VRP) &lt;<a href=3D"mailto:zhangxudong=
@huawei.com" style=3D"color: blue; text-decoration: underline;">zhangxudong=
@huawei.com</a>&gt;;
<a href=3D"mailto:lizhenqiang@chinamobile.com" style=3D"color: blue; text-d=
ecoration: underline;">
lizhenqiang@chinamobile.com</a><br>
<b>Subject:</b> Re: [OSPF] Solicit feedbacks on draft-dong-ospf-maxage-flus=
h-problem-statement</span><span lang=3D"EN-US" style=3D"color:black"><o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">Jie =E2=80=93=
</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">Thinking abou=
t the following some more:</span><span lang=3D"EN-US" style=3D"color:black"=
><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<i><span lang=3D"EN-US" style=3D"font-size:11.0pt;color:red">&lt;snip&gt;</=
span></i><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<i><span lang=3D"EN-US" style=3D"font-size:11.0pt;color:red">What remains i=
s the possibility that an implementation has some bug and unintentionally m=
odifies the age to something other than what it should be due to the actual=
 elapsed time since LSA generation.
 I suppose a mechanism equivalent to what the IS-IS draft defined i.e. sett=
ing the age to =E2=80=9Cnew=E2=80=9D (0 in OSPF case) when first receiving =
a non-self-generated LSA could be useful to prevent negative impacts of suc=
h an implementation bug. Is this what you intend?</span></i><span lang=3D"E=
N-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<i><span lang=3D"EN-US" style=3D"font-size:11.0pt;color:red">&nbsp;</span><=
/i><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<i><span lang=3D"EN-US" style=3D"font-size:11.0pt;color:red">[Jie]: More sp=
ecifically, the problem could be caused by either =E2=80=9Csetting the LS a=
ge field incorrectly due to implementation bug=E2=80=9D or =E2=80=9Csystem =
timer runs so fast that the LS age reaches MaxAge much earlier
 than other routers=E2=80=9D. Another less likely case is that the LS age f=
ield is corrupted before the LSA is assembled into OSPF packet.</span></i><=
span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<i><span lang=3D"EN-US" style=3D"font-size:11.0pt;color:red">&lt;end snip&g=
t;</span></i><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">The benefits =
are extremely limited. If a router prematurely ages an LSA due to a timer b=
ug, ignoring the received LSA age on reception isn=E2=80=99t going to preve=
nt premature purging by the router which has
 the bug. So the effect of ignoring the received LSA age prior to reaching =
MAXAGE will be short lived. You are then left with the possibility that an =
implementation corrupts the LSA age BEFORE calculating checksum/crypto auth=
entication =E2=80=93 but its local timeout
 logic is unaffected. This has very limited value. Whether the WG considers=
 this worth pursuing is something you need to ask. For myself, I don=E2=80=
=99t see much ROI here.</span><span lang=3D"EN-US" style=3D"color:black"><o=
:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;&nbsp;L=
es</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<b><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Tahoma, sans=
-serif; color: black;">From:</span></b><span lang=3D"EN-US" style=3D"font-s=
ize: 10pt; font-family: Tahoma, sans-serif; color: black;"> Dongjie (Jimmy)=
 [<a href=3D"mailto:jie.dong@huawei.com" style=3D"color: blue; text-decorat=
ion: underline;">mailto:jie.dong@huawei.com</a>]
<br>
<b>Sent:</b> Monday, August 01, 2016 9:43 PM<br>
<b>To:</b> Les Ginsberg (ginsberg); <a href=3D"mailto:ospf@ietf.org" style=
=3D"color: blue; text-decoration: underline;">
ospf@ietf.org</a><br>
<b>Cc:</b> Zhangxudong (zhangxudong, VRP); <a href=3D"mailto:lizhenqiang@ch=
inamobile.com" style=3D"color: blue; text-decoration: underline;">
lizhenqiang@chinamobile.com</a><br>
<b>Subject:</b> RE: [OSPF] Solicit feedbacks on draft-dong-ospf-maxage-flus=
h-problem-statement</span><span lang=3D"EN-US" style=3D"color:black"><o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">Hi Les, </span><span lang=3D"E=
N-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">Please see my replies with [Ji=
e2]:</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p=
>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<b><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Tahoma, sans=
-serif; color: black;">From:</span></b><span lang=3D"EN-US" style=3D"font-s=
ize: 10pt; font-family: Tahoma, sans-serif; color: black;"> Les Ginsberg (g=
insberg) [<a href=3D"mailto:ginsberg@cisco.com" style=3D"color: blue; text-=
decoration: underline;">mailto:ginsberg@cisco.com</a>]
<br>
<b>Sent:</b> Monday, August 01, 2016 9:57 PM<br>
<b>To:</b> Dongjie (Jimmy); <a href=3D"mailto:ospf@ietf.org" style=3D"color=
: blue; text-decoration: underline;">
ospf@ietf.org</a><br>
<b>Cc:</b> Zhangxudong (zhangxudong, VRP); <a href=3D"mailto:lizhenqiang@ch=
inamobile.com" style=3D"color: blue; text-decoration: underline;">
lizhenqiang@chinamobile.com</a><br>
<b>Subject:</b> RE: [OSPF] Solicit feedbacks on draft-dong-ospf-maxage-flus=
h-problem-statement</span><span lang=3D"EN-US" style=3D"color:black"><o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">Jie -</span><=
span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<b><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Tahoma, sans=
-serif; color: black;">From:</span></b><span lang=3D"EN-US" style=3D"font-s=
ize: 10pt; font-family: Tahoma, sans-serif; color: black;"> Dongjie (Jimmy)=
 [<a href=3D"mailto:jie.dong@huawei.com" style=3D"color: blue; text-decorat=
ion: underline;">mailto:jie.dong@huawei.com</a>]
<br>
<b>Sent:</b> Monday, August 01, 2016 1:44 AM<br>
<b>To:</b> Les Ginsberg (ginsberg); <a href=3D"mailto:ospf@ietf.org" style=
=3D"color: blue; text-decoration: underline;">
ospf@ietf.org</a><br>
<b>Cc:</b> Zhangxudong (zhangxudong, VRP); <a href=3D"mailto:lizhenqiang@ch=
inamobile.com" style=3D"color: blue; text-decoration: underline;">
lizhenqiang@chinamobile.com</a><br>
<b>Subject:</b> RE: [OSPF] Solicit feedbacks on draft-dong-ospf-maxage-flus=
h-problem-statement</span><span lang=3D"EN-US" style=3D"color:black"><o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">Hi Les,</span><span lang=3D"EN=
-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">Please see inline with [Jie]:<=
/span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<b><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Tahoma, sans=
-serif; color: black;">From:</span></b><span lang=3D"EN-US" style=3D"font-s=
ize: 10pt; font-family: Tahoma, sans-serif; color: black;"> Les Ginsberg (g=
insberg) [<a href=3D"mailto:ginsberg@cisco.com" style=3D"color: blue; text-=
decoration: underline;">mailto:ginsberg@cisco.com</a>]
<br>
<b>Sent:</b> Monday, August 01, 2016 3:09 PM<br>
<b>To:</b> Dongjie (Jimmy); <a href=3D"mailto:ospf@ietf.org" style=3D"color=
: blue; text-decoration: underline;">
ospf@ietf.org</a><br>
<b>Cc:</b> Zhangxudong (zhangxudong, VRP); <a href=3D"mailto:lizhenqiang@ch=
inamobile.com" style=3D"color: blue; text-decoration: underline;">
lizhenqiang@chinamobile.com</a><br>
<b>Subject:</b> RE: [OSPF] Solicit feedbacks on draft-dong-ospf-maxage-flus=
h-problem-statement</span><span lang=3D"EN-US" style=3D"color:black"><o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">Jie =E2=80=93=
</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">Fully agree t=
hat IS-IS and OSPF differ in this regard.</span><span lang=3D"EN-US" style=
=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D"><a href=3D"ht=
tps://www.ietf.org/id/draft-ietf-isis-remaining-lifetime-01.txt" style=3D"c=
olor: blue; text-decoration: underline;">https://www.ietf.org/id/draft-ietf=
-isis-remaining-lifetime-01.txt</a> addresses
 problems where corruption of the remaining lifetime occurs either during t=
ransmission/reception or due to some DOS attack. This isn=E2=80=99t a conce=
rn w OSPF (hope you agree).</span><span lang=3D"EN-US" style=3D"color:black=
"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">[Jie]: Yes, for OSPF the corru=
ption during packet transmission can be detected.</span><span lang=3D"EN-US=
" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">What remains =
is the possibility that an implementation has some bug and unintentionally =
modifies the age to something other than what it should be due to the actua=
l elapsed time since LSA generation.
 I suppose a mechanism equivalent to what the IS-IS draft defined i.e. sett=
ing the age to =E2=80=9Cnew=E2=80=9D (0 in OSPF case) when first receiving =
a non-self-generated LSA could be useful to prevent negative impacts of suc=
h an implementation bug. Is this what you intend?</span><span lang=3D"EN-US=
" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">[Jie]: More specifically, the =
problem could be caused by either =E2=80=9Csetting the LS age field incorre=
ctly due to implementation bug=E2=80=9D or =E2=80=9Csystem timer runs so fa=
st that the LS age reaches MaxAge much earlier than other routers=E2=80=9D.
 Another less likely case is that the LS age field is corrupted before the =
LSA is assembled into OSPF packet.</span><span lang=3D"EN-US" style=3D"colo=
r:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">[Jie]: Regarding the solutions=
 space, IMO we need to consider both cases: =E2=80=9CLS age reaches MaxAge=
=E2=80=9D and =E2=80=9CLS age close to MaxAge=E2=80=9D. For IS-IS, RFC 6232=
 and RFC 6233 provide solutions for the detection and identification
 of corrupted IS-IS purge, while OSPF does not have similar mechanisms.</sp=
an><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<b><i><span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">[Les:] =
It is incorrect to say that RFC 6232 makes it possible to detect a corrupt =
purge. What it does do is to provide an indication as to which IS initiated=
 a purge. I don=E2=80=99t know how OSPF would
 address this issue, but for OSPFv2 at least any solution would likely not =
be backwards compatible. For this reason I suggest that you not try to addr=
ess this issue in the same draft.</span></i></b><span lang=3D"EN-US" style=
=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<b><i><span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span></i></b><sp=
an lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">[Jie2]: Agreed, RFC 6232 provi=
de the mechanism to track the misbehaved routers so that operator can fix t=
he problem, the detection can be based on the rules in RFC 6233 or some oth=
er anomalies. Indeed for OSPFv2 legacy
 LSAs, it is difficult to introduce the mechanism similar to RFC 6232, whil=
e it can be easier for the OSPFv2/v3 Extended LSAs. So it depends on how ba=
ckward compatible the solution should be. I agree with you that the solutio=
n for Problem Localization in OSPF
 needs to be provided in a separate document.</span><span lang=3D"EN-US" st=
yle=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<b><i><span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;<=
/span></i></b><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span>=
</p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<b><i><span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">Solutio=
ns to LS age &nbsp;corruption can be done in a backwards compatible way, bu=
t they &nbsp;MUST NOT result in discarding purges which pass authentication=
- doing so places you at risk for having inconsistent
 LSDBs in the network.</span></i></b><span lang=3D"EN-US" style=3D"color:bl=
ack"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">[Jie2]: Exactly. The received =
MaxAge LSAs cannot simply be discarded, the decision must be made carefully=
, probably based on some additional information. The authors has discussed =
some possible solution internally, and
 will prepare some material for further open discussion.</span><span lang=
=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">As written, t=
he draft makes claims that are at least misleading =E2=80=93 and I believe =
actually incorrect. In Section 6 you say:</span><span lang=3D"EN-US" style=
=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">=E2=80=9CThe =
LS age field may be altered as a result of</span><span lang=3D"EN-US" style=
=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;&nbsp; =
packet corruption, such modification cannot be detected by LSA</span><span =
lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;&nbsp; =
checksum nor OSPF packet cryptographic authentication.=E2=80=9D</span><span=
 lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">This isn=E2=
=80=99t correct.</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:=
p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">[Jie] Thanks for pointing out =
this. This sentence need to be revised to mention =E2=80=9CLSA corruption=
=E2=80=9D rather than =E2=80=9Cpacket corruption=E2=80=9D.</span><span lang=
=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">What would be=
 helpful =E2=80=93 at least to me =E2=80=93 is to move from a generic probl=
em statement to the specific problem you want to solve and the proposed sol=
ution. This also requires you to more clearly state
 the cases where there is an actual vulnerability. It would be a lot easier=
 to support the draft if this were done.</span><span lang=3D"EN-US" style=
=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">[Jie] Thanks for your suggesti=
on. Yes we can update this draft with more specific problem statements as I=
 mentioned above.
</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">[Jie] As for the proposed solu=
tions, the current draft specifies the requirements on the potential soluti=
ons, from which we envision that different solutions maybe needed for =E2=
=80=9CImpact Mitigation=E2=80=9D and =E2=80=9CProblem Localization=E2=80=9D=
.
 The solution for =E2=80=9CImpact mitigation=E2=80=9D can be the easier one=
, for which we can start to discuss the potential solutions now. While the =
solution for =E2=80=9Cproblem localization=E2=80=9D may need more considera=
tions.</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<b><i><span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">[Les:] =
A discussion of the requirements is useful and necessary, but IMO until you=
 propose a solution there isn=E2=80=99t enough substance for the document t=
o become a WG document.</span></i></b><span lang=3D"EN-US" style=3D"color:b=
lack"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">[Jie2] Yes th=
e current draft focuses on the problem statement and the requirements, the =
goal is to firstly get the MaxAge flush problem acknowledged and reach cons=
ensus on the requirements. Then the
 plan is to specify the solutions in separate documents.&nbsp; Your valuabl=
e suggestions will be considered, and further contributions are welcome.</s=
pan><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">Best regards,=
</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">Jie</span><sp=
an lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<b><i><span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;<=
/span></i></b><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span>=
</p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<b><i><span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;&=
nbsp;&nbsp; Les</span></i></b><span lang=3D"EN-US" style=3D"color:black"><o=
:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">Best regards,</span><span lang=
=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">Jie</span><span lang=3D"EN-US"=
 style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;&nbsp; =
Les</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<b><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Tahoma, sans=
-serif; color: black;">From:</span></b><span lang=3D"EN-US" style=3D"font-s=
ize: 10pt; font-family: Tahoma, sans-serif; color: black;"> Dongjie (Jimmy)=
 [<a href=3D"mailto:jie.dong@huawei.com" style=3D"color: blue; text-decorat=
ion: underline;">mailto:jie.dong@huawei.com</a>]
<br>
<b>Sent:</b> Sunday, July 31, 2016 11:48 PM<br>
<b>To:</b> Les Ginsberg (ginsberg); <a href=3D"mailto:ospf@ietf.org" style=
=3D"color: blue; text-decoration: underline;">
ospf@ietf.org</a><br>
<b>Cc:</b> Zhangxudong (zhangxudong, VRP); <a href=3D"mailto:lizhenqiang@ch=
inamobile.com" style=3D"color: blue; text-decoration: underline;">
lizhenqiang@chinamobile.com</a><br>
<b>Subject:</b> RE: [OSPF] Solicit feedbacks on draft-dong-ospf-maxage-flus=
h-problem-statement</span><span lang=3D"EN-US" style=3D"color:black"><o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">Hi Les, </span><span lang=3D"E=
N-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">Thanks for your comments.</spa=
n><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">OSPF packet level checksum and=
 authentication can only protect the assembled LSU packet one hop on the wi=
re, while cannot detect any change to LSA made by the routers. This is beca=
use the OSPF packets are re-assembled
 on each hop, which is slightly different from IS-IS. So the problem for OS=
PF is mainly due to the problems inside the router, for example protocol im=
plementations, system timers, or some hardware problem. Actually this probl=
em has been seen in several production
 networks.</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">We can improve the description=
 in the draft to make this clear.</span><span lang=3D"EN-US" style=3D"color=
:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">Best regards,</span><span lang=
=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">Jie</span><span lang=3D"EN-US"=
 style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;</span><span lang=3D"EN-=
US" style=3D"color:black"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<b><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Tahoma, sans=
-serif; color: black;">From:</span></b><span lang=3D"EN-US" style=3D"font-s=
ize: 10pt; font-family: Tahoma, sans-serif; color: black;"> Les Ginsberg (g=
insberg) [<a href=3D"mailto:ginsberg@cisco.com" style=3D"color: blue; text-=
decoration: underline;">mailto:ginsberg@cisco.com</a>]
<br>
<b>Sent:</b> Monday, August 01, 2016 1:30 PM<br>
<b>To:</b> Dongjie (Jimmy); <a href=3D"mailto:ospf@ietf.org" style=3D"color=
: blue; text-decoration: underline;">
ospf@ietf.org</a><br>
<b>Cc:</b> Zhangxudong (zhangxudong, VRP); <a href=3D"mailto:lizhenqiang@ch=
inamobile.com" style=3D"color: blue; text-decoration: underline;">
lizhenqiang@chinamobile.com</a><br>
<b>Subject:</b> RE: [OSPF] Solicit feedbacks on draft-dong-ospf-maxage-flus=
h-problem-statement</span><span lang=3D"EN-US" style=3D"color:black"><o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">Jie =E2=80=93=
</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">The draft say=
s (Section 2):</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p>=
</span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">=E2=80=9CSinc=
e cryptographic authentication is executed at the OSPF packet</span><span l=
ang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;&nbsp; =
level, it can only protect the assembled LSU packet for one hop and</span><=
span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;&nbsp; =
does not provide any additional protection for the corruption of LS</span><=
span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;&nbsp; =
age field.=E2=80=9D</span><span lang=3D"EN-US" style=3D"color:black"><o:p><=
/o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">But as authen=
tication is calculated at the OSPF packet level, any change to the LS age f=
ield for an individual LSA contained within the OSPF packet (e.g. by some p=
acket corruption in transmission) would
 cause authentication to fail when the packet is received. So the statement=
 you make is not correct. I therefore am struggling to understand what prob=
lem you believe is not addressed by existing authentication techniques.</sp=
an><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;&nbsp; =
Les</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D">&nbsp;</span>=
<span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<b><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Tahoma, sans=
-serif; color: black;">From:</span></b><span lang=3D"EN-US" style=3D"font-s=
ize: 10pt; font-family: Tahoma, sans-serif; color: black;"> OSPF [<a href=
=3D"mailto:ospf-bounces@ietf.org" style=3D"color: blue; text-decoration: un=
derline;">mailto:ospf-bounces@ietf.org</a>]
<b>On Behalf Of </b>Dongjie (Jimmy)<br>
<b>Sent:</b> Sunday, July 31, 2016 8:15 PM<br>
<b>To:</b> <a href=3D"mailto:ospf@ietf.org" style=3D"color: blue; text-deco=
ration: underline;">
ospf@ietf.org</a><br>
<b>Cc:</b> Zhangxudong (zhangxudong, VRP); <a href=3D"mailto:lizhenqiang@ch=
inamobile.com" style=3D"color: blue; text-decoration: underline;">
lizhenqiang@chinamobile.com</a><br>
<b>Subject:</b> [OSPF] Solicit feedbacks on draft-dong-ospf-maxage-flush-pr=
oblem-statement</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p=
></span></p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align: justify; margin:=
 0px 0cm; font-size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">Hi all,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">draft-dong-ospf-maxage-flush-pro=
blem-statement describes the problems caused by the corruption of the LS Ag=
e field, and summarizes the requirements on potential solutions. This draft=
 received good comments during the presentation
 on the IETF meeting in B.A.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">The authors would like to solici=
t further feedbacks from the mailing list, on both the problem statement an=
d the solution requirements. Based on the feedbacks, we will update the pro=
blem statement draft, and work together
 to build suitable solutions. <o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">The URL of the draft is:<o:p></o=
:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black"><a href=3D"https://tools.ietf.or=
g/html/draft-dong-ospf-maxage-flush-problem-statement-00" style=3D"color: b=
lue; text-decoration: underline;">https://tools.ietf.org/html/draft-dong-os=
pf-maxage-flush-problem-statement-00</a><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">Comments &amp; feedbacks are wel=
come.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">Best regards,<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">Jie<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; text-align: justify; font-=
size: 10.5pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:p></o:p></span></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</blockquote>
</span></div>
</div>
</blockquote>
</div>
</div>
</blockquote>
</span></div>
</div>
</blockquote>
<div></div>
</div>
</td>
</tr>
</tbody>
</table>
<br>
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From: Chris Bowers <cbowers@juniper.net>
To: "ospf@ietf.org" <ospf@ietf.org>
Thread-Topic: removing Controlled Convergence TLV from draft-ietf-ospf-mrt
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Archived-At: <https://mailarchive.ietf.org/arch/msg/ospf/vKC-_SL1rYx8qMFvJynE2AP9mj8>
Subject: [OSPF] removing Controlled Convergence TLV from draft-ietf-ospf-mrt
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OSPF WG,

The authors of draft-ietf-ospf-mrt are planning to remove the Controlled Co=
nvergence TLV from that draft,
and instead use an equivalent extension being defined in:

https://tools.ietf.org/html/draft-bryant-rtgwg-param-sync-00

Since the Controlled Convergence TLV communicates information that may be u=
seful for
applications other that MRT, it makes sense to have it in a separate docume=
nt to allow it to be
better vetted in the context of those other applications.

I don't think that anyone has implemented the Controlled Convergence TLV in=
 draft-ietf-ospf-mrt.
But if this is not the case, or anyone has another objection to removing it=
 from draft-ietf-ospf-mrt-02, please
raise that objection in the next week or so.

Thanks,
Chris



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<font face=3D"Calibri" size=3D"2"><span style=3D"font-size:11pt;">
<div>OSPF WG,</div>
<div>&nbsp;</div>
<div>The authors of draft-ietf-ospf-mrt are planning to remove the Controll=
ed Convergence TLV from that draft,</div>
<div>and instead use an equivalent extension being defined in:</div>
<div>&nbsp;</div>
<div><a href=3D"https://tools.ietf.org/html/draft-bryant-rtgwg-param-sync-0=
0"><font color=3D"#0563C1"><u>https://tools.ietf.org/html/draft-bryant-rtgw=
g-param-sync-00</u></font></a></div>
<div>&nbsp;</div>
<div>Since the Controlled Convergence TLV communicates information that may=
 be useful for</div>
<div>applications other that MRT, it makes sense to have it in a separate d=
ocument to allow it to be</div>
<div>better vetted in the context of those other applications.&nbsp; </div>
<div>&nbsp;</div>
<div>I don&#8217;t think that anyone has implemented the Controlled Converg=
ence TLV in draft-ietf-ospf-mrt.</div>
<div>But if this is not the case, or anyone has another objection to removi=
ng it from draft-ietf-ospf-mrt-02, please </div>
<div>raise that objection in the next week or so.</div>
<div>&nbsp;</div>
<div>Thanks,</div>
<div>Chris</div>
<div>&nbsp;</div>
<div>&nbsp;</div>
</span></font>
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From nobody Tue Oct 18 19:56:28 2016
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Open Shortest Path First IGP of the IETF.

        Title           : Signaling Entropy Label Capability Using OSPF
        Authors         : Xiaohu Xu
                          Sriganesh Kini
                          Siva Sivabalan
                          Clarence Filsfils
                          Stephane Litkowski
	Filename        : draft-ietf-ospf-mpls-elc-03.txt
	Pages           : 7
	Date            : 2016-10-18

Abstract:
   Multi Protocol Label Switching (MPLS) has defined a mechanism to load
   balance traffic flows using Entropy Labels (EL).  An ingress LSR
   cannot insert ELs for packets going into a given tunnel unless an
   egress LSR has indicated via signaling that it can process ELs on
   that tunnel.  This draft defines a mechanism to signal that
   capability using OSPF.  This mechanism is useful when the label
   advertisement is also done via OSPF.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-ospf-mpls-elc-03

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-mpls-elc-03


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Chris Bowers <cbowers@juniper.net>, "ospf@ietf.org" <ospf@ietf.org>
Thread-Topic: [OSPF] removing Controlled Convergence TLV from draft-ietf-ospf-mrt
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From nobody Fri Oct 21 05:01:42 2016
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Subject: [OSPF] I-D Action: draft-ietf-ospf-ospfv3-lsa-extend-13.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Open Shortest Path First IGP of the IETF.

        Title           : OSPFv3 LSA Extendibility
        Authors         : Acee Lindem
                          Sina Mirtorabi
                          Abhay Roy
                          Fred Baker
	Filename        : draft-ietf-ospf-ospfv3-lsa-extend-13.txt
	Pages           : 37
	Date            : 2016-10-21

Abstract:
   OSPFv3 requires functional extension beyond what can readily be done
   with the fixed-format Link State Advertisement (LSA) as described in
   RFC 5340.  Without LSA extension, attributes associated with OSPFv3
   links and advertised IPv6 prefixes must be advertised in separate
   LSAs and correlated to the fixed-format LSAs.  This document extends
   the LSA format by encoding the existing OSPFv3 LSA information in
   Type-Length-Value (TLV) tuples and allowing advertisement of
   additional information with additional TLVs.  Backward compatibility
   mechanisms are also described.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ospf-ospfv3-lsa-extend/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-ospf-ospfv3-lsa-extend-13

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-ospfv3-lsa-extend-13


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


From nobody Fri Oct 21 07:17:20 2016
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From: "Acee Lindem (acee)" <acee@cisco.com>
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Thread-Topic: New Version Notification for draft-ietf-ospf-ospfv3-lsa-extend-13.txt
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: OSPF WG List <ospf@ietf.org>
Thread-Topic: [netmod] Delay in publication request of routing-cfg and current -state conventions
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Date: Fri, 21 Oct 2016 15:20:19 +0000
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Subject: [OSPF] FW: [netmod] Delay in publication request of routing-cfg and current -state conventions
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From nobody Fri Oct 21 16:24:30 2016
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Subject: [OSPF] ospf - Requested session has been scheduled for IETF 97
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Dear Acee Lindem,

The session(s) that you have requested have been scheduled.
Below is the scheduled session information followed by
the original request. 

ospf Session 1 (1:30:00)
    Wednesday, Morning Session I 0930-1100
    Room Name: Park Ballroom 1 size: 125
    ---------------------------------------------
    


Request Information:


---------------------------------------------------------
Working Group Name: Open Shortest Path First IGP
Area Name: Routing Area
Session Requester: Acee Lindem

Number of Sessions: 1
Length of Session(s):  1.5 Hours
Number of Attendees: 50
Conflicts to Avoid: 
 First Priority: idr bess isis rtgwg rtgarea spring bier pim netmod




Special Requests:
  Please schedule the session adjacent (i.e., immediately preceding or following) IS-IS in the same room if possible. We are trying for a joint session. 
---------------------------------------------------------


From nobody Mon Oct 24 07:30:04 2016
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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, OSPF WG List <ospf@ietf.org>
Thread-Topic: [OSPF] WG Adoption Poll for "Signaling MSD (Maximum SID Depth) using OSPF"
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Date: Mon, 24 Oct 2016 14:29:56 +0000
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Subject: Re: [OSPF] WG Adoption Poll for "Signaling MSD (Maximum SID Depth) using OSPF"
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From: Manav Bhatia <manavbhatia@gmail.com>
Date: Mon, 24 Oct 2016 20:10:20 +0530
Message-ID: <CAG1kdoje9cFxmOVRp8sbvSh=56BSN2OU96t+NQaCYmfXM_m56A@mail.gmail.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
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Cc: OSPF WG List <ospf@ietf.org>
Subject: Re: [OSPF] WG Adoption Poll for "Signaling MSD (Maximum SID Depth) using OSPF"
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I also support the draft.

Cheers, Manav

On Mon, Oct 24, 2016 at 7:59 PM, Les Ginsberg (ginsberg) <ginsberg@cisco.co=
m
> wrote:

> I have read the draft and believe the simple protocol extension advertise=
s
> information which is useful.
>
> I support WG adoption.
>
>
>
>     Les
>
>
>
>
>
> *From:* OSPF [mailto:ospf-bounces@ietf.org] *On Behalf Of *Acee Lindem
> (acee)
> *Sent:* Tuesday, October 11, 2016 11:57 AM
> *To:* OSPF WG List
> *Subject:* [OSPF] WG Adoption Poll for "Signaling MSD (Maximum SID Depth)
> using OSPF"
>
>
>
> Please indicate your support or objection to OSPF WG Adoption for
> "Signaling MSD (Maximum SID Depth) using OSPF=E2=80=9D before 10/26/2016.
>
>
>
> For your convenience, here is a URL: https://www.ietf.org/id/
> draft-tantsura-ospf-segment-routing-msd-01.txt
>
>
>
> Thanks,
>
> Acee and Abhay
>
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf
>
>

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<div dir=3D"ltr">I also support the draft.<div><br></div><div>Cheers, Manav=
<br><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Mon, Oct 2=
4, 2016 at 7:59 PM, Les Ginsberg (ginsberg) <span dir=3D"ltr">&lt;<a href=
=3D"mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg@cisco.com</a>&gt;=
</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .=
8ex;border-left:1px #ccc solid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_-3987033181616305253WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1f497d">I have read the draft and=
 believe the simple protocol extension advertises information which is usef=
ul.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1f497d">I support WG adoption.<u>=
</u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1f497d"><u></u>=C2=A0<u></u></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1f497d">=C2=A0=C2=A0=C2=A0 Les<u>=
</u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1f497d"><u></u>=C2=A0<u></u></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1f497d"><u></u>=C2=A0<u></u></spa=
n></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> OSPF [ma=
ilto:<a href=3D"mailto:ospf-bounces@ietf.org" target=3D"_blank">ospf-bounce=
s@ietf.org</a>]
<b>On Behalf Of </b>Acee Lindem (acee)<br>
<b>Sent:</b> Tuesday, October 11, 2016 11:57 AM<br>
<b>To:</b> OSPF WG List<br>
<b>Subject:</b> [OSPF] WG Adoption Poll for &quot;Signaling MSD (Maximum SI=
D Depth) using OSPF&quot;<u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black">Please indicate your suppor=
t or objection to OSPF WG Adoption for &quot;Signaling MSD (Maximum SID Dep=
th) using OSPF=E2=80=9D before 10/26/2016.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black"><u></u>=C2=A0<u></u></span>=
</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black">For your convenience, here =
is a URL:=C2=A0<a href=3D"https://www.ietf.org/id/draft-tantsura-ospf-segme=
nt-routing-msd-01.txt" target=3D"_blank">https://www.ietf.org/id/<wbr>draft=
-tantsura-ospf-segment-<wbr>routing-msd-01.txt</a><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black"><u></u>=C2=A0<u></u></span>=
</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black">Thanks,<u></u><u></u></span=
></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black">Acee and Abhay<u></u><u></u=
></span></p>
</div>
</div>
</div>
</div>

<br>______________________________<wbr>_________________<br>
OSPF mailing list<br>
<a href=3D"mailto:OSPF@ietf.org">OSPF@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/ospf" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/<wbr>listinfo/ospf</a><br>
<br></blockquote></div><br></div></div></div>

--001a113e37da0a4bd0053f9d5f31--


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References: <D422AE3E.82436%acee@cisco.com>
From: Pushpasis Sarkar <pushpasis.ietf@gmail.com>
Date: Mon, 24 Oct 2016 20:26:38 +0530
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To: "Acee Lindem (acee)" <acee@cisco.com>
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Support adoption of the draft.

Thanks
Pushpasis

On Oct 12, 2016 00:27, "Acee Lindem (acee)" <acee@cisco.com> wrote:

> Please indicate your support or objection to OSPF WG Adoption for
> "Signaling MSD (Maximum SID Depth) using OSPF=E2=80=9D before 10/26/2016.
>
> For your convenience, here is a URL: https://www.ietf.org/id/
> draft-tantsura-ospf-segment-routing-msd-01.txt
>
> Thanks,
> Acee and Abhay
>
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf
>
>

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<p dir=3D"ltr">Support adoption of the draft.</p>
<p dir=3D"ltr">Thanks<br>
Pushpasis</p>
<div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Oct 12, 2016 0=
0:27, &quot;Acee Lindem (acee)&quot; &lt;<a href=3D"mailto:acee@cisco.com">=
acee@cisco.com</a>&gt; wrote:<br type=3D"attribution"><blockquote class=3D"=
gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-=
left:1ex">



<div style=3D"word-wrap:break-word;color:rgb(0,0,0);font-size:14px;font-fam=
ily:Calibri,sans-serif">
<div>Please indicate your support or objection to OSPF WG Adoption for &quo=
t;Signaling MSD (Maximum SID Depth) using OSPF=E2=80=9D before 10/26/2016.<=
/div>
<div><br>
</div>
<div>For your convenience, here is a URL:=C2=A0<a href=3D"https://www.ietf.=
org/id/draft-tantsura-ospf-segment-routing-msd-01.txt" target=3D"_blank">ht=
tps://www.ietf.org/id/<wbr>draft-tantsura-ospf-segment-<wbr>routing-msd-01.=
txt</a></div>
<div><br>
</div>
<div>Thanks,</div>
<div>Acee and Abhay</div>
</div>

<br>______________________________<wbr>_________________<br>
OSPF mailing list<br>
<a href=3D"mailto:OSPF@ietf.org">OSPF@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/ospf" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/<wbr>listinfo/ospf</a><br>
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Support.

Peter

On 11/10/16 11:57 , Acee Lindem (acee) wrote:
> Please indicate your support or objection to OSPF WG Adoption for
> "Signaling MSD (Maximum SID Depth) using OSPF” before 10/26/2016.
>
> For your convenience, here is a
> URL: https://www.ietf.org/id/draft-tantsura-ospf-segment-routing-msd-01.txt
>
> Thanks,
> Acee and Abhay
>
>
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf
>


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Subject: Re: [OSPF] WG Adoption Poll for "Signaling MSD (Maximum SID Depth) using OSPF"
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Support

-Michael

From: OSPF [mailto:ospf-bounces@ietf.org] On Behalf Of Acee Lindem (acee)=

Sent: Tuesday, October 11, 2016 11:57 AM
To: OSPF WG List
Subject: [OSPF] WG Adoption Poll for "Signaling MSD (Maximum SID Depth) u=
sing
OSPF"

Please indicate your support or objection to OSPF WG Adoption for "Signal=
ing
MSD (Maximum SID Depth) using OSPF=E2=80=9D before 10/26/2016.

For your convenience, here is a URL:
https://www.ietf.org/id/draft-tantsura-ospf-segment-routing-msd-01.txt

Thanks,
Acee and Abhay

_______________________________________________
OSPF mailing list
OSPF@ietf.org
https://www.ietf.org/mailman/listinfo/ospf




From nobody Mon Oct 24 09:43:28 2016
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From: "Yingzhen Qu (yiqu)" <yiqu@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, OSPF WG List <ospf@ietf.org>
Thread-Topic: [OSPF] WG Adoption Poll for "Signaling MSD (Maximum SID Depth) using OSPF"
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--_000_D4338815817CFyiquciscocom_
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Support.

Thanks,
Yingzhen

From: OSPF <ospf-bounces@ietf.org<mailto:ospf-bounces@ietf.org>> on behalf =
of "Acee Lindem (acee)" <acee@cisco.com<mailto:acee@cisco.com>>
Date: Tuesday, October 11, 2016 at 11:57 AM
To: OSPF WG List <ospf@ietf.org<mailto:ospf@ietf.org>>
Subject: [OSPF] WG Adoption Poll for "Signaling MSD (Maximum SID Depth) usi=
ng OSPF"

Please indicate your support or objection to OSPF WG Adoption for "Signalin=
g MSD (Maximum SID Depth) using OSPF" before 10/26/2016.

For your convenience, here is a URL: https://www.ietf.org/id/draft-tantsura=
-ospf-segment-routing-msd-01.txt

Thanks,
Acee and Abhay

--_000_D4338815817CFyiquciscocom_
Content-Type: text/html; charset="iso-8859-1"
Content-ID: <20DE968597D8BA409A334562992263D4@emea.cisco.com>
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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-lin=
e-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-fami=
ly: Calibri, sans-serif;">
<div>Support.</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Yingzhen</div>
<div><br>
</div>
<span id=3D"OLK_SRC_BODY_SECTION">
<div style=3D"font-family:Calibri; font-size:11pt; text-align:left; color:b=
lack; BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM:=
 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid;=
 BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<span style=3D"font-weight:bold">From: </span>OSPF &lt;<a href=3D"mailto:os=
pf-bounces@ietf.org">ospf-bounces@ietf.org</a>&gt; on behalf of &quot;Acee =
Lindem (acee)&quot; &lt;<a href=3D"mailto:acee@cisco.com">acee@cisco.com</a=
>&gt;<br>
<span style=3D"font-weight:bold">Date: </span>Tuesday, October 11, 2016 at =
11:57 AM<br>
<span style=3D"font-weight:bold">To: </span>OSPF WG List &lt;<a href=3D"mai=
lto:ospf@ietf.org">ospf@ietf.org</a>&gt;<br>
<span style=3D"font-weight:bold">Subject: </span>[OSPF] WG Adoption Poll fo=
r &quot;Signaling MSD (Maximum SID Depth) using OSPF&quot;<br>
</div>
<div><br>
</div>
<div>
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line=
-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-famil=
y: Calibri, sans-serif;">
<div>Please indicate your support or objection to OSPF WG Adoption for &quo=
t;Signaling MSD (Maximum SID Depth) using OSPF&#8221; before 10/26/2016.</d=
iv>
<div><br>
</div>
<div>For your convenience, here is a URL:&nbsp;<a href=3D"https://www.ietf.=
org/id/draft-tantsura-ospf-segment-routing-msd-01.txt">https://www.ietf.org=
/id/draft-tantsura-ospf-segment-routing-msd-01.txt</a></div>
<div><br>
</div>
<div>Thanks,</div>
<div>Acee and Abhay</div>
</div>
</div>
</span>
</body>
</html>

--_000_D4338815817CFyiquciscocom_--


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From: "Mercia Zheng (merciaz)" <merciaz@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, OSPF WG List <ospf@ietf.org>
Thread-Topic: [OSPF] WG Adoption Poll for "Signaling MSD (Maximum SID Depth) using OSPF"
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Date: Mon, 24 Oct 2016 17:16:04 +0000
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Subject: Re: [OSPF] WG Adoption Poll for "Signaling MSD (Maximum SID Depth) using OSPF"
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Support.

Thanks,
-Mercia

From: "Acee Lindem (acee)" <acee@cisco.com<mailto:acee@cisco.com>>
Date: Tuesday, October 11, 2016 at 11:57 AM
To: OSPF WG List <ospf@ietf.org<mailto:ospf@ietf.org>>
Subject: [OSPF] WG Adoption Poll for "Signaling MSD (Maximum SID Depth) usi=
ng OSPF"

Please indicate your support or objection to OSPF WG Adoption for "Signalin=
g MSD (Maximum SID Depth) using OSPF" before 10/26/2016.

For your convenience, here is a URL: https://www.ietf.org/id/draft-tantsura=
-ospf-segment-routing-msd-01.txt

Thanks,
Acee and Abhay

--_000_D4338F0B91378merciazciscocom_
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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
</head>
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e-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-fami=
ly: Calibri, sans-serif;">
<div>Support.</div>
<div><br>
</div>
<div>Thanks,</div>
<div>-Mercia</div>
<div><br>
</div>
<span id=3D"OLK_SRC_BODY_SECTION">
<div style=3D"font-family:Calibri; font-size:11pt; text-align:left; color:b=
lack; BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM:=
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 BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<span style=3D"font-weight:bold">From: </span>&quot;Acee Lindem (acee)&quot=
; &lt;<a href=3D"mailto:acee@cisco.com">acee@cisco.com</a>&gt;<br>
<span style=3D"font-weight:bold">Date: </span>Tuesday, October 11, 2016 at =
11:57 AM<br>
<span style=3D"font-weight:bold">To: </span>OSPF WG List &lt;<a href=3D"mai=
lto:ospf@ietf.org">ospf@ietf.org</a>&gt;<br>
<span style=3D"font-weight:bold">Subject: </span>[OSPF] WG Adoption Poll fo=
r &quot;Signaling MSD (Maximum SID Depth) using OSPF&quot;<br>
</div>
<div><br>
</div>
<div>
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line=
-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-famil=
y: Calibri, sans-serif;">
<div>Please indicate your support or objection to OSPF WG Adoption for &quo=
t;Signaling MSD (Maximum SID Depth) using OSPF&#8221; before 10/26/2016.</d=
iv>
<div><br>
</div>
<div>For your convenience, here is a URL:&nbsp;<a href=3D"https://www.ietf.=
org/id/draft-tantsura-ospf-segment-routing-msd-01.txt">https://www.ietf.org=
/id/draft-tantsura-ospf-segment-routing-msd-01.txt</a></div>
<div><br>
</div>
<div>Thanks,</div>
<div>Acee and Abhay</div>
</div>
</div>
</span>
</body>
</html>

--_000_D4338F0B91378merciazciscocom_--


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Thread-Topic: [OSPF] WG Adoption Poll for "Signaling MSD (Maximum SID Depth) using OSPF"
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From: Abhay Roy <akr@cisco.com>
To: "ospf@ietf.org" <ospf@ietf.org>, draft-ppsenak-ospf-te-link-attr-reuse@tools.ietf.org
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Subject: [OSPF] WG Adoption Poll for draft-ppsenak-ospf-te-link-attr-reuse
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Dear WG,

Authors of draft-ppsenak-ospf-te-link-attr-reuse would like to poll the 
WG for adoption of this document as a WG Draft. Please send your 
opinions / concerns.

This begins the two week WG adoption poll which will conclude on Nov 9th 
2016.

Authors, we need your explicit response on this thread to capture your 
answer on if you are aware of any IPR related to this draft.

Regards,
-Abhay


From nobody Tue Oct 25 22:43:14 2016
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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "Abhay Roy (akr)" <akr@cisco.com>, "ospf@ietf.org" <ospf@ietf.org>, "draft-ppsenak-ospf-te-link-attr-reuse@tools.ietf.org" <draft-ppsenak-ospf-te-link-attr-reuse@tools.ietf.org>
Thread-Topic: [OSPF] WG Adoption Poll for draft-ppsenak-ospf-te-link-attr-reuse
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Subject: Re: [OSPF] WG Adoption Poll for draft-ppsenak-ospf-te-link-attr-reuse
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Support adoption as co-author.

I am not aware of any relevant IPR.

   Les


> -----Original Message-----
> From: OSPF [mailto:ospf-bounces@ietf.org] On Behalf Of Abhay Roy (akr)
> Sent: Tuesday, October 25, 2016 10:28 PM
> To: ospf@ietf.org; draft-ppsenak-ospf-te-link-attr-reuse@tools.ietf.org
> Subject: [OSPF] WG Adoption Poll for draft-ppsenak-ospf-te-link-attr-reus=
e
>=20
> Dear WG,
>=20
> Authors of draft-ppsenak-ospf-te-link-attr-reuse would like to poll the W=
G
> for adoption of this document as a WG Draft. Please send your opinions /
> concerns.
>=20
> This begins the two week WG adoption poll which will conclude on Nov 9th
> 2016.
>=20
> Authors, we need your explicit response on this thread to capture your
> answer on if you are aware of any IPR related to this draft.
>=20
> Regards,
> -Abhay
>=20
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf


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To: Abhay Roy <akr@cisco.com>, "ospf@ietf.org" <ospf@ietf.org>, <draft-ppsenak-ospf-te-link-attr-reuse@tools.ietf.org>
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Support as co-author

 
Cheers,
Jeff
 



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From: "Yingzhen Qu (yiqu)" <yiqu@cisco.com>
To: Jeff Tantsura <jefftant.ietf@gmail.com>, "Abhay Roy (akr)" <akr@cisco.com>, "ospf@ietf.org" <ospf@ietf.org>, "draft-ppsenak-ospf-te-link-attr-reuse@tools.ietf.org" <draft-ppsenak-ospf-te-link-attr-reuse@tools.ietf.org>
Thread-Topic: [OSPF] WG Adoption Poll for draft-ppsenak-ospf-te-link-attr-reuse
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Date: Wed, 26 Oct 2016 06:20:53 +0000
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Subject: Re: [OSPF] WG Adoption Poll for draft-ppsenak-ospf-te-link-attr-reuse
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Support.

Thanks,
Yingzhen

On 10/25/16, 10:48 PM, "OSPF on behalf of Jeff Tantsura"
<ospf-bounces@ietf.org on behalf of jefftant.ietf@gmail.com> wrote:

>Support as co-author
>
>=20
>Cheers,
>Jeff
>=20
>
>
>_______________________________________________
>OSPF mailing list
>OSPF@ietf.org
>https://www.ietf.org/mailman/listinfo/ospf


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Date: Tue, 25 Oct 2016 23:20:56 -0700
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: Abhay Roy <akr@cisco.com>, "ospf@ietf.org" <ospf@ietf.org>, <draft-ppsenak-ospf-te-link-attr-reuse@tools.ietf.org>
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Subject: Re: [OSPF] WG Adoption Poll for draft-ppsenak-ospf-te-link-attr-reuse
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Not aware of any IPR related to this draft.

 
Cheers,
Jeff
 

On 10/25/16, 22:27, "OSPF on behalf of Abhay Roy" <ospf-bounces@ietf.org on behalf of akr@cisco.com> wrote:

    Dear WG,
    
    Authors of draft-ppsenak-ospf-te-link-attr-reuse would like to poll the 
    WG for adoption of this document as a WG Draft. Please send your 
    opinions / concerns.
    
    This begins the two week WG adoption poll which will conclude on Nov 9th 
    2016.
    
    Authors, we need your explicit response on this thread to capture your 
    answer on if you are aware of any IPR related to this draft.
    
    Regards,
    -Abhay
    
    _______________________________________________
    OSPF mailing list
    OSPF@ietf.org
    https://www.ietf.org/mailman/listinfo/ospf
    



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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Abhay Roy (akr)" <akr@cisco.com>, "ospf@ietf.org" <ospf@ietf.org>, "draft-ppsenak-ospf-te-link-attr-reuse@tools.ietf.org" <draft-ppsenak-ospf-te-link-attr-reuse@tools.ietf.org>
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From nobody Wed Oct 26 08:48:38 2016
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Subject: Re: [OSPF] WG Adoption Poll for draft-ppsenak-ospf-te-link-attr-reuse
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Support adoption as co-author.

I am not aware of any IPR related to this draft.

Peter



On 25/10/16 22:27 , Abhay Roy wrote:
> Dear WG,
>
> Authors of draft-ppsenak-ospf-te-link-attr-reuse would like to poll the
> WG for adoption of this document as a WG Draft. Please send your
> opinions / concerns.
>
> This begins the two week WG adoption poll which will conclude on Nov 9th
> 2016.
>
> Authors, we need your explicit response on this thread to capture your
> answer on if you are aware of any IPR related to this draft.
>
> Regards,
> -Abhay
>
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf
> .
>


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From: "Ketan Jivan Talaulikar (ketant)" <ketant@cisco.com>
To: "Abhay Roy (akr)" <akr@cisco.com>, "ospf@ietf.org" <ospf@ietf.org>, "draft-ppsenak-ospf-te-link-attr-reuse@tools.ietf.org" <draft-ppsenak-ospf-te-link-attr-reuse@tools.ietf.org>
Thread-Topic: [OSPF] WG Adoption Poll for draft-ppsenak-ospf-te-link-attr-reuse
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Support

Thanks,
Ketan

-----Original Message-----
From: OSPF [mailto:ospf-bounces@ietf.org] On Behalf Of Abhay Roy (akr)
Sent: 25 October 2016 22:28
To: ospf@ietf.org; draft-ppsenak-ospf-te-link-attr-reuse@tools.ietf.org
Subject: [OSPF] WG Adoption Poll for draft-ppsenak-ospf-te-link-attr-reuse

Dear WG,

Authors of draft-ppsenak-ospf-te-link-attr-reuse would like to poll the=20
WG for adoption of this document as a WG Draft. Please send your=20
opinions / concerns.

This begins the two week WG adoption poll which will conclude on Nov 9th=20
2016.

Authors, we need your explicit response on this thread to capture your=20
answer on if you are aware of any IPR related to this draft.

Regards,
-Abhay

_______________________________________________
OSPF mailing list
OSPF@ietf.org
https://www.ietf.org/mailman/listinfo/ospf


From nobody Fri Oct 28 08:40:54 2016
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Subject: [OSPF] I-D Action: draft-ietf-ospf-segment-routing-extensions-10.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Open Shortest Path First IGP of the IETF.

        Title           : OSPF Extensions for Segment Routing
        Authors         : Peter Psenak
                          Stefano Previdi
                          Clarence Filsfils
                          Hannes Gredler
                          Rob Shakir
                          Wim Henderickx
                          Jeff Tantsura
	Filename        : draft-ietf-ospf-segment-routing-extensions-10.txt
	Pages           : 35
	Date            : 2016-10-28

Abstract:
   Segment Routing (SR) allows a flexible definition of end-to-end paths
   within IGP topologies by encoding paths as sequences of topological
   sub-paths, called "segments".  These segments are advertised by the
   link-state routing protocols (IS-IS and OSPF).

   This draft describes the OSPF extensions required for Segment
   Routing.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ospf-segment-routing-extensions/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-ospf-segment-routing-extensions-10

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-segment-routing-extensions-10


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


From nobody Fri Oct 28 08:41:15 2016
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Open Shortest Path First IGP of the IETF.

        Title           : OSPFv3 Extensions for Segment Routing
        Authors         : Peter Psenak
                          Stefano Previdi
                          Clarence Filsfils
                          Hannes Gredler
                          Rob Shakir
                          Wim Henderickx
                          Jeff Tantsura
	Filename        : draft-ietf-ospf-ospfv3-segment-routing-extensions-07.txt
	Pages           : 36
	Date            : 2016-10-28

Abstract:
   Segment Routing (SR) allows for a flexible definition of end-to-end
   paths within IGP topologies by encoding paths as sequences of
   topological sub-paths, called "segments".  These segments are
   advertised by the link-state routing protocols (IS-IS and OSPF).

   This draft describes the OSPFv3 extensions that are required for
   Segment Routing.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ospf-ospfv3-segment-routing-extensions/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-ospf-ospfv3-segment-routing-extensions-07

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-ospfv3-segment-routing-extensions-07


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


From nobody Fri Oct 28 12:25:55 2016
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From: "Acee Lindem (acee)" <acee@cisco.com>
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From: "Acee Lindem (acee)" <acee@cisco.com>
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From nobody Mon Oct 31 16:56:35 2016
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Subject: [OSPF] I-D Action: draft-ietf-ospf-yang-06.txt
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X-List-Received-Date: Mon, 31 Oct 2016 23:56:14 -0000

A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Open Shortest Path First IGP of the IETF.

        Title           : Yang Data Model for OSPF Protocol
        Authors         : Derek Yeung
                          Yingzhen Qu
                          Jeffrey Zhang
                          Ing-Wher Chen
                          Acee Lindem
	Filename        : draft-ietf-ospf-yang-06.txt
	Pages           : 98
	Date            : 2016-10-31

Abstract:
   This document defines a YANG data model that can be used to configure
   and manage OSPF.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ospf-yang/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-ospf-yang-06

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-yang-06


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From nobody Mon Oct 31 17:10:48 2016
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Open Shortest Path First IGP of the IETF.

        Title           : Yang Data Model for OSPF SR (Segment Routing) Protocol
        Authors         : Derek Yeung
                          Yingzhen Qu
                          Jeffrey Zhang
                          Ing-Wher Chen
                          Acee Lindem
	Filename        : draft-ietf-ospf-sr-yang-00.txt
	Pages           : 29
	Date            : 2016-10-31

Abstract:
   This document defines a YANG data model that can be used to configure
   and manage OSPF Segment Routing.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ospf-sr-yang/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-ospf-sr-yang-00


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

